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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.

Summary:

Although effective with captive loggerhead (Caretta caretta) and Kemp˙s ridley (Lepiochelys kempii) sea turtles, blue dyed bait is not effective in reducing olive ridley (Lepidochelys olivacea) and green sea turtle (Chelonia mydas) bycatch in longline fisheries in Costa Rica.

Summary:

18/0 circle hooks when compared with J hooks significantly reduce loggerhead (Caretta caretta) and leatherback (Dermocheles coriacea) sea turtle bycatch in Atlantic longline fisheries for pelagic swordfish. Circle hooks also reduced the rate of hook ingestion by loggerhead sea turtles. The combination of circle hooks and mackerel bait was the most effective in reducing sea turtle bycatch and had no negative effect on swordfish catch. Use of novel bait species (mackerel instead of squid bait) reduced loggerhead (Caretta caretta) and leatherback (Dermocheles coriacea) sea turtle bycatch in the Atlantic longline swordfish fishery. Loggerhead sea turtle (Caretta caretta) bycatch in the Atlantic longline fishery increased with an increase in total soak time. Soak time was insignificant for swordfish but it was significant for bigeye tuna.

Summary:

18/0 circle hooks when compared with J hooks significantly reduce loggerhead (Caretta caretta) and leatherback (Dermocheles coriacea) sea turtle bycatch in Atlantic longline fisheries for pelagic swordfish. Circle hooks also reduced the rate of hook ingestion by loggerhead sea turtles. The combination of circle hooks and mackerel bait was the most effective in reducing sea turtle bycatch and had no negative effect on swordfish catch. Use of novel bait species (mackerel instead of squid bait) reduced loggerhead (Caretta caretta) and leatherback (Dermocheles coriacea) sea turtle bycatch in the Atlantic longline swordfish fishery. Loggerhead sea turtle (Caretta caretta) bycatch in the Atlantic longline fishery increased with an increase in total soak time. Soak time was insignificant for swordfish but it was significant for bigeye tuna.

Summary:

18/0 circle hooks when compared with J hooks significantly reduce loggerhead (Caretta caretta) and leatherback (Dermocheles coriacea) sea turtle bycatch in Atlantic longline fisheries for pelagic swordfish. Circle hooks also reduced the rate of hook ingestion by loggerhead sea turtles. The combination of circle hooks and mackerel bait was the most effective in reducing sea turtle bycatch and had no negative effect on swordfish catch. Use of novel bait species (mackerel instead of squid bait) reduced loggerhead (Caretta caretta) and leatherback (Dermocheles coriacea) sea turtle bycatch in the Atlantic longline swordfish fishery. Loggerhead sea turtle (Caretta caretta) bycatch in the Atlantic longline fishery increased with an increase in total soak time. Soak time was insignificant for swordfish but it was significant for bigeye tuna.

Summary: Underwater setting chutes reduce bycatch of seabirds--Laysan (Phoebastria immutabilis) and Black-footed (P. nigripes) albatrosses--in the Hawaiian longline tuna fishery. The underwater setting techniques increased bait retention.

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.

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.

Summary: Barrier nets effectively excluded seals and sea lions from fishing nets in British Columbia.

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.