❓ A WA parliamentary question on notice regarding the removal of fish and marron from Waroona Dam, including species, quantities, methods, costs, and a related plan for Drakes Brook Dam. The answer provides details on the destocking program, species removed, costs, and methods used.
AnsweredQoN 55Legislative Assembly
QuestionView source ↗
(b) what species were removed from the Waroona Dam; (c) what was the quantity of each species removed from the Waroona Dam; (d) what quantity of red fin perch was removed and what was done with these fish; (e) did the Fisheries Department perform this work at the Waroona Dam or was some or all of the task contracted out and, if so, who undertook this work and at what cost; (f) what were the details of the brief provided by the Water Corporation in respect of the work coordinated by or undertaken by the Fisheries Department at the Waroona Dam; (g) what was the total cost of removing, holding and returning stock to the Waroona Dam; (h) was any blasting conducted by or on behalf of the Fisheries Department as part of this process and, if so, what are the details of the blasting process used at Waroona Dam; (i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(c) what was the quantity of each species removed from the Waroona Dam; (d) what quantity of red fin perch was removed and what was done with these fish; (e) did the Fisheries Department perform this work at the Waroona Dam or was some or all of the task contracted out and, if so, who undertook this work and at what cost; (f) what were the details of the brief provided by the Water Corporation in respect of the work coordinated by or undertaken by the Fisheries Department at the Waroona Dam; (g) what was the total cost of removing, holding and returning stock to the Waroona Dam; (h) was any blasting conducted by or on behalf of the Fisheries Department as part of this process and, if so, what are the details of the blasting process used at Waroona Dam; (i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(d) what quantity of red fin perch was removed and what was done with these fish; (e) did the Fisheries Department perform this work at the Waroona Dam or was some or all of the task contracted out and, if so, who undertook this work and at what cost; (f) what were the details of the brief provided by the Water Corporation in respect of the work coordinated by or undertaken by the Fisheries Department at the Waroona Dam; (g) what was the total cost of removing, holding and returning stock to the Waroona Dam; (h) was any blasting conducted by or on behalf of the Fisheries Department as part of this process and, if so, what are the details of the blasting process used at Waroona Dam; (i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(e) did the Fisheries Department perform this work at the Waroona Dam or was some or all of the task contracted out and, if so, who undertook this work and at what cost; (f) what were the details of the brief provided by the Water Corporation in respect of the work coordinated by or undertaken by the Fisheries Department at the Waroona Dam; (g) what was the total cost of removing, holding and returning stock to the Waroona Dam; (h) was any blasting conducted by or on behalf of the Fisheries Department as part of this process and, if so, what are the details of the blasting process used at Waroona Dam; (i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(f) what were the details of the brief provided by the Water Corporation in respect of the work coordinated by or undertaken by the Fisheries Department at the Waroona Dam; (g) what was the total cost of removing, holding and returning stock to the Waroona Dam; (h) was any blasting conducted by or on behalf of the Fisheries Department as part of this process and, if so, what are the details of the blasting process used at Waroona Dam; (i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(g) what was the total cost of removing, holding and returning stock to the Waroona Dam; (h) was any blasting conducted by or on behalf of the Fisheries Department as part of this process and, if so, what are the details of the blasting process used at Waroona Dam; (i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(h) was any blasting conducted by or on behalf of the Fisheries Department as part of this process and, if so, what are the details of the blasting process used at Waroona Dam; (i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
a) The Department of Fisheries and Murdoch University were responsible for the removal of fish and marron stocks while works were undertaken at Waroona Dam. The methods employed during the destocking program included draining, netting, targeted destocking (baited drop nets, fish traps and scoops), concussive techniques (blasting) and electrofishing. b) The major species removed from Waroona Dam and its tributaries included; - marron ( Cherax tenuimanus ) - gilgies ( Cherax quinquecarinatus ) - western minnow ( Galaxias occidentalis ) - rainbow trout ( Oncorhynchus mykiss ) - brown trout ( Salmo trutta ) - redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
b) The major species removed from Waroona Dam and its tributaries included; - marron ( Cherax tenuimanus ) - gilgies ( Cherax quinquecarinatus ) - western minnow ( Galaxias occidentalis ) - rainbow trout ( Oncorhynchus mykiss ) - brown trout ( Salmo trutta ) - redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- marron ( Cherax tenuimanus ) - gilgies ( Cherax quinquecarinatus ) - western minnow ( Galaxias occidentalis ) - rainbow trout ( Oncorhynchus mykiss ) - brown trout ( Salmo trutta ) - redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- gilgies ( Cherax quinquecarinatus ) - western minnow ( Galaxias occidentalis ) - rainbow trout ( Oncorhynchus mykiss ) - brown trout ( Salmo trutta ) - redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- western minnow ( Galaxias occidentalis ) - rainbow trout ( Oncorhynchus mykiss ) - brown trout ( Salmo trutta ) - redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- rainbow trout ( Oncorhynchus mykiss ) - brown trout ( Salmo trutta ) - redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- brown trout ( Salmo trutta ) - redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
(c) what was the quantity of each species removed from the Waroona Dam; (d) what quantity of red fin perch was removed and what was done with these fish; (e) did the Fisheries Department perform this work at the Waroona Dam or was some or all of the task contracted out and, if so, who undertook this work and at what cost; (f) what were the details of the brief provided by the Water Corporation in respect of the work coordinated by or undertaken by the Fisheries Department at the Waroona Dam; (g) what was the total cost of removing, holding and returning stock to the Waroona Dam; (h) was any blasting conducted by or on behalf of the Fisheries Department as part of this process and, if so, what are the details of the blasting process used at Waroona Dam; (i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(d) what quantity of red fin perch was removed and what was done with these fish; (e) did the Fisheries Department perform this work at the Waroona Dam or was some or all of the task contracted out and, if so, who undertook this work and at what cost; (f) what were the details of the brief provided by the Water Corporation in respect of the work coordinated by or undertaken by the Fisheries Department at the Waroona Dam; (g) what was the total cost of removing, holding and returning stock to the Waroona Dam; (h) was any blasting conducted by or on behalf of the Fisheries Department as part of this process and, if so, what are the details of the blasting process used at Waroona Dam; (i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(e) did the Fisheries Department perform this work at the Waroona Dam or was some or all of the task contracted out and, if so, who undertook this work and at what cost; (f) what were the details of the brief provided by the Water Corporation in respect of the work coordinated by or undertaken by the Fisheries Department at the Waroona Dam; (g) what was the total cost of removing, holding and returning stock to the Waroona Dam; (h) was any blasting conducted by or on behalf of the Fisheries Department as part of this process and, if so, what are the details of the blasting process used at Waroona Dam; (i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(f) what were the details of the brief provided by the Water Corporation in respect of the work coordinated by or undertaken by the Fisheries Department at the Waroona Dam; (g) what was the total cost of removing, holding and returning stock to the Waroona Dam; (h) was any blasting conducted by or on behalf of the Fisheries Department as part of this process and, if so, what are the details of the blasting process used at Waroona Dam; (i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(g) what was the total cost of removing, holding and returning stock to the Waroona Dam; (h) was any blasting conducted by or on behalf of the Fisheries Department as part of this process and, if so, what are the details of the blasting process used at Waroona Dam; (i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(h) was any blasting conducted by or on behalf of the Fisheries Department as part of this process and, if so, what are the details of the blasting process used at Waroona Dam; (i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(i) if so, why was blasting used; (j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(j) what other methods of removing fish and marron from the Waroona Dam and culling red fin perch were considered before work was undertaken; (k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(k) did the Fisheries Department prepare a plan for the removal of fish and marron from the Drakes Brook Dam, on behalf of the Water Corporation; (l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(l) was this work at Drakes Brook Dam to be undertaken using the same methods used at the Waroona Dam and, if not, what were the differences; (m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(m) what was the total cost of this plan in relation to Drakes Brook Dam; (n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(n) why was the removal of fish from Drakes Brook Dam not undertaken; and (o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
(o) has the Fisheries Department considered using operators in accordance with Exemption 464 to perform fish and marron removal and red fin perch culling from south west dams and, if so, why has this method not been selected?
a) The Department of Fisheries and Murdoch University were responsible for the removal of fish and marron stocks while works were undertaken at Waroona Dam. The methods employed during the destocking program included draining, netting, targeted destocking (baited drop nets, fish traps and scoops), concussive techniques (blasting) and electrofishing. b) The major species removed from Waroona Dam and its tributaries included; - marron ( Cherax tenuimanus ) - gilgies ( Cherax quinquecarinatus ) - western minnow ( Galaxias occidentalis ) - rainbow trout ( Oncorhynchus mykiss ) - brown trout ( Salmo trutta ) - redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
b) The major species removed from Waroona Dam and its tributaries included; - marron ( Cherax tenuimanus ) - gilgies ( Cherax quinquecarinatus ) - western minnow ( Galaxias occidentalis ) - rainbow trout ( Oncorhynchus mykiss ) - brown trout ( Salmo trutta ) - redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- marron ( Cherax tenuimanus ) - gilgies ( Cherax quinquecarinatus ) - western minnow ( Galaxias occidentalis ) - rainbow trout ( Oncorhynchus mykiss ) - brown trout ( Salmo trutta ) - redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- gilgies ( Cherax quinquecarinatus ) - western minnow ( Galaxias occidentalis ) - rainbow trout ( Oncorhynchus mykiss ) - brown trout ( Salmo trutta ) - redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- western minnow ( Galaxias occidentalis ) - rainbow trout ( Oncorhynchus mykiss ) - brown trout ( Salmo trutta ) - redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- rainbow trout ( Oncorhynchus mykiss ) - brown trout ( Salmo trutta ) - redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- brown trout ( Salmo trutta ) - redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- redfin perch ( Perca fluviatilis ) c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
c) The following qualities of each species were removed from Waroona Dam; - 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- 2,104 marron - 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- 401 gilgies - 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- 108 western minnows - 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- 77 rainbow trout - 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- 22 brown trout - 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
- 922 redfin perch d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of. e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500. f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to; ? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout; ? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works; ? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing; ? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
? Control feral species within the residual coffer dams during refurbishment of Waroona Dam; ? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and ? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout. g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam. h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist. i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries. j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing. k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam. l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale. m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project. n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled. o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this. The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
AnswerView source ↗
Answered
28 June 2005
Responded by
Minister representing the Minister for Fisheries
Response time
34 days
I thank the Member for some notice of this question.
a) The Department of Fisheries and Murdoch University were responsible for the removal of fish and marron stocks while works were undertaken at Waroona Dam. The methods employed during the destocking program included draining, netting, targeted destocking (baited drop nets, fish traps and scoops), concussive techniques (blasting) and electrofishing.
b) The major species removed from Waroona Dam and its tributaries included;
- marron (
Cherax tenuimanus
)
- gilgies (
Cherax quinquecarinatus
)
- western minnow (
Galaxias occidentalis
)
- rainbow trout (
Oncorhynchus mykiss
)
- brown trout (
Salmo trutta
)
- redfin perch (
Perca fluviatilis
)
c) The following qualities of each species were removed from Waroona Dam;
- 2,104 marron
- 401 gilgies
- 108 western minnows
- 77 rainbow trout
- 22 brown trout
- 922 redfin perch
d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of.
e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500.
f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to;
? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout;
? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works;
? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing;
? Control feral species within the residual coffer dams during refurbishment of Waroona Dam;
? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and
? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout.
g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam.
h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist.
i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries.
j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing.
k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam.
l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale.
m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project.
n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled.
o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this.
The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
a) The Department of Fisheries and Murdoch University were responsible for the removal of fish and marron stocks while works were undertaken at Waroona Dam. The methods employed during the destocking program included draining, netting, targeted destocking (baited drop nets, fish traps and scoops), concussive techniques (blasting) and electrofishing.
b) The major species removed from Waroona Dam and its tributaries included;
- marron (
Cherax tenuimanus
)
- gilgies (
Cherax quinquecarinatus
)
- western minnow (
Galaxias occidentalis
)
- rainbow trout (
Oncorhynchus mykiss
)
- brown trout (
Salmo trutta
)
- redfin perch (
Perca fluviatilis
)
c) The following qualities of each species were removed from Waroona Dam;
- 2,104 marron
- 401 gilgies
- 108 western minnows
- 77 rainbow trout
- 22 brown trout
- 922 redfin perch
d) Of the 922 redfin perch that were removed from Waroona Dam, 55 fish were euthanased and the stomach contents used to complete a trout fry versus trout yearling mortality trial being conducted by the Department of Fisheries. The remaining redfin perch were euthanased, utilised for scientific purposes; and then disposed of.
e) The destocking program was conducted by Department of Fisheries staff, staff and students from Murdoch University and volunteers from the local Waroona community, marron logbook holders and the Water Corporation. The cost of the destocking component of the project was approximately $23,500.
f) Negotiations between the Department of Fisheries, Murdoch University and the Water Corporation were undertaken in 2001 and an action plan to reduce the impacts of dam draining on the aquatic species within Waroona Dam was developed that would be compatible with the refurbishment works. The objectives of the plan were to;
? De-stock Waroona Dam of large numbers of target species of aquatic fauna prior to draining. The target species were marron, gilgies, western minnow, western pygmy perch, rainbow trout and brown trout;
? Transport marron to purpose built ponds at the Pemberton Freshwater Research Centre, gilgies and native fishes to culture facilities at Murdoch University and marron and native fishes to Alcoa's Willowdale marron farm, and establish and maintain breeding populations for re-stocking of Waroona Dam after the completion of the refurbishment works;
? Transport aquatic animals, surplus to breeding requirements, to adjacent waters open to recreational fishing;
? Control feral species within the residual coffer dams during refurbishment of Waroona Dam;
? Install appropriate artificial habitats within the basin of Waroona Dam in an attempt to enhance marron and native fish stocks by providing refugia in the otherwise barren basin; and
? Re-stock the refurbished dam with marron, gilgies and native fishes, and eventually rainbow trout.
g) The budgeted cost of the de-stocking, breeding and restocking project was approximately $415,000. This amount included contributions from the Department of Fisheries, the Water Corporation, Murdoch University and Alcoa. The Department of Fisheries primary role in the project was to supply holding facilities at Pemberton Research Centre and maintain stock until released back into the Dam.
h) Concussive techniques (blasting) were utilised to attempt to control exotic species in Waroona Dam. The concussive technique involved the use of emulsion explosives under the direction of a shot firing specialist.
i) Concussive techniques were one of four strategies employed to control exotic species in Waroona Dam and its tributaries.
j) The other techniques employed to control exotic fish in Waroona Dam and its tributaries were draining, netting and electrofishing.
k) The Department of Fisheries and Murdoch University recently prepared a plan for the destocking, breeding and restocking of fish and marron from Drakes Brook Dam.
l) The Drakes Brook Dam proposal was to employ the same destocking and restocking methods utilised in the Waroona Dam project on a smaller scale.
m) The total estimated cost for the destocking, breeding and restocking program for Drakes Brook Dam was approximately $180,000. It was anticipated that the Department of Fisheries as well as Murdoch University and the Water Corporation would contribute funding for the project.
n) The destocking program in Drakes Brook Dam was not undertaken due to a decision by the Water Corporation to defer the draining and inspection of the dam until 2007 when major works had been scheduled.
o) The Department of Fisheries has considered the services of the operator listed in Exemption 464 (Mr Matthew Anderson) in relation to the destocking of Drakes Brook Dam, however, this option has not been progressed since the draining of the dam was deferred. The focus of fisheries activities during the drawdown of Water Corporation dams is the temporary removal of native species and trout for subsequent restocking. The removal of redfin perch is a secondary objective however the low water levels provide an opportunity to undertake this.
The Department continues to take action in relation to feral aquatic species, which may involve the eradication of fish from ponds/dams in the southwest. However, it should be noted that each situation needs to be assessed on an individual basis in support of applying the appropriate management techniques. Electro-fishing may be applied for the control of feral fish, or used when harvesting fish, but as a method of eradication in pond/dam situations it is not accepted as an effective tool. In these cases it is much more likely that chemical control and concussive techniques would be applied.
Explore WA Government Data
Search the full archive in the free dashboard, or query programmatically via API.
Explore more
Government Gazette
Appointments, regulatory notices, planning changes.
Hansard
Debates, questions, speeches and sentiment.
Tabled Papers
Reports and documents tabled in Parliament.
Committees
Committee profiles and recent reports.
Regulations
Subsidiary legislation with filters and summaries.
Bills
Proposed laws and parliamentary progress.
Acts
Current WA legislation and summaries.
Explanatory Memoranda
Bills with EMs (text/PDF) available.
Members
MP profiles, party breakdown and rankings.
Pollie Rankings
Data-driven rankings across 19 categories.
Amendment Chains
Track how schemes and regulations evolve over time.