Search The Database

Displaying 1 - 10 of 29

Location	Gear	Catch	Technique	Bycatch species	Type	Results
Washington State		Trout	Acoustic deterrent devices	Pinnipeds	Field study in the wild	Summary: Predator sounds (killer whales) did not deter sea lion predation on a steelhead trout fishery in Washington. Effect on Bycatch: Did not deter predation Reference: Scordino, J. and Pfeifer, R., 1993 , Sea lion/steelhead conflict at the Ballad Locks, Seattle. National Marine Fisheries Service and Washington Department of Wildlife, Seattle, Washington.
Washington State		Trout	Acoustic deterrent devices	Pinnipeds	Field study in the wild	Summary: Pyrotechnic seal bombs do not deter sea lions from locks in Washington, over time. Effect on Bycatch: Did not deter sea lions Reference: National Marine Fisheries Service and Washington Department of Fish and Wildlife., 1995 , Environmental assessment on protecting winter-run wild steelhead from predation by California sea lions in the Lake Washington Ship Canal. NMFS/WDFW Environmental Assessment Report, Seattle, Washington.
California	Gillnets and Entangling Nets	Swordfish & Shark	Acoustic deterrent devices	Pinnipeds	Field study in the wild	Summary: Pingers reduce bycatch of California sea lions (Zalophus californianus) and short-beaked common dolphins (Delphinus delphis) in the California drift gillnet fishery for swordfish and sharks. Catch of target fish species (broadbill swordfish, common thresher shark, and shortfin mako shark) and non-target species were not affected by pinger use. Effect on Bycatch: Reduced bycatch Reference: Barlow, J. and Cameron, G.A., 2003 , Field Experiments Show That Acoustic Pingers Reduce Marine Mammal Bycatch in the California Drift Gill Net Fishery
Argentina	Gillnets and Entangling Nets	Sea trout, croaker, letherjack, Patagonian smooth hound	Acoustic deterrent devices	Pinnipeds	Field study in the wild	Summary: Pingers are effective in reducing the bycatch of Franciscana dolphins (Pontoporia blainvillei) but increase interactions between fishing gear and South American sea lions (Otaria byronia) in an Argentinian bottom gillnet fishery. Effect on Bycatch: Increased interactions between gear and sea lions Reference: Bordino, P., Kraus, S., Albareda, D., Fazio, A., Palmerio, A., Mendez, M. & Botta, S., 2002 , Reducing incidental mortality of Franciscana dolphin Pontoporia blainvillei with acoustic warning devices attached to fishing nets.
Washington State	Gillnets and Entangling Nets	Salmon & sturgeon	Acoustic deterrent devices	Pinnipeds	Field study in the wild	Summary: Pingers do not reduce bycatch of harbor seals (Phoca vitulina) in the salmon and sturgeon gillnet fisheries in northern Washington state but do reduce bycatch of harbor porpoise (Phocoena phocoena). Pingers did not affect catch of target species, chinook salmon (Oncorhynchus tshawytscha) and sturgeon (Acipenser sp.). Effect on Bycatch: Did not reduce seal bycatch Reference: Gearin, P.J., Gosho, M.E., Laake, J.L., Cooke, L., Delong, R.L. & Hughes, K.M., 2000 , Experimental testing of acoustic alarms (pingers) to reduce bycatch of harbor porpoise, Phocoena phocoena, in the state of Washington
Oregon	Gillnets and Entangling Nets	Salmon	Acoustic deterrent devices	Pinnipeds	Field study in the wild	Summary: Harbor seals (Phoca vitulina) appeared to habituate to acoustic harassment devices placed on gillnets in the Oregon salmon fishery. Results, although inconclusive, demonstrate a possible reduction in damaged salmon, at least in the short-term. Effect on Bycatch: Seals habituated to AHDs Reference: Geiger, A.C. and S.J. Jeffries, 1987 , Evaluation of seal harassment techniques to protect gill netted salmon.
United States	Gillnets and Entangling Nets	Multiple species	Acoustic deterrent devices	Pinnipeds	Field study in the wild	Summary: Acoustic alarms reduce bycatch of harbor porpoises (Phocoena phocoena) in the Gulf of Maine sink gillnet fishery. Gillnets with and without acoustic alarms caught similar quantities of target species, cod and pollock. Acoustic alarms did not affect catch of bycaught silver hake, but Atlantic herring was caught less frequently in experimental nets with alarms. Harbour seals depredated fish caught in both nets with and without acoustic alarms. Effect on Bycatch: Seals depredated nets with and without pingers Reference: Kraus, S.D., A.J. Read, A. Solow, K. Baldwin, T. Spradlin, E. Anderson and J. Williamson., 1997 , Acoustic alarms reduce porpoise mortality
Canada		Scallop	Fence or net barriers	Pinnipeds	Field study in the wild	Summary: Barrier nets effectively excluded seals and sea lions from fishing nets in British Columbia. Effect on Bycatch: Excluded pinnipeds Reference: Iwama, G., L. Nichol, and J. Ford., 1997 , Aquatic mammals and other species. Discussion Paper, Part E. Salmon Aquaculture Review; Technical Advisory Team Discussion Papers Vol. 3, British Columbia Environmental Assessment Office.
Washington State		Trout	Noxious bait	Pinnipeds	Field study in the wild	Summary: Over time, noxious bait, consisting of dead steelhead containing lithium chloride, did not prevent California sea lion (Zalophus californianus) predation of Washington steelhead trout (Salmo gairdneri). Acoustic harassment devices worked only for a short time in reducing California sea lion depredation before sea lions began to habituate to sounds. Effect on Bycatch: Did not prevent predation Reference: Gearin, P.J., R. Pfeifer, S.J. Jeffries, R.L. DeLong, and M.A. Johnson., 1988 , Results of the 1986-87 California sea lion-steelhead trout predation control program at the Hiram M. Chittenden Locks. NWAFC Processed Report 88-30, Alaska Fisheries Science Center, NMFS, NOAA, Seattle, Washington.
Washington State		Trout	Acoustic deterrent devices	Pinnipeds	Field study in the wild	Summary: Over time, noxious bait, consisting of dead steelhead containing lithium chloride, did not prevent California sea lion (Zalophus californianus) predation of Washington steelhead trout (Salmo gairdneri). Acoustic harassment devices worked only for a short time in reducing California sea lion depredation before sea lions began to habituate to sounds. Effect on Bycatch: Worked temporarily, then habituation occurred Reference: Gearin, P.J., R. Pfeifer, S.J. Jeffries, R.L. DeLong, and M.A. Johnson., 1988 , Results of the 1986-87 California sea lion-steelhead trout predation control program at the Hiram M. Chittenden Locks. NWAFC Processed Report 88-30, Alaska Fisheries Science Center, NMFS, NOAA, Seattle, Washington.

Fishing Gear

Bycatch Species

Reduction technique

Include Non-Field Studies

Author(s)