Search The Database
Location | Gear | Catch | Technique | Bycatch species | Type | Results |
---|---|---|---|---|---|---|
Location Atlantic and Gulf of Mexico |
Gear
Trawls
|
Catch shrimp | Technique
Excluder devices
|
Bycatch species Sea Turtles | Type Field study in the wild | Results Turtle Excluder Devices reduce sea turtle bycatch in the Atlantic and Gulf of Mexico shrimp trawl fishery. |
Location New Zealand |
Gear
Trawls
|
Catch Hoki | Technique | Bycatch species Pinnipeds | Type Field study in the wild | Results Acoustic Harassment Devices were not found to be effective in deterring New Zealand fur seals (Arctocephalus forsteri) from mid-water trawls in the New Zealand hoki fishery. Sea Lion Escape Devices are undergoing testing in New Zealand˙s hoki trawl fishery (for fur seals) and the squid trawl fishery (for Hookers˙s sea lion). Preliminary results indicate squid and fish loss via the escape hatch was minimal; in the hoki fishery, fish loss was confined to fast swimming species, including jack mackerel and warehou. |
Location New Zealand |
Gear
Trawls
|
Catch Hoki | Technique
Excluder devices
|
Bycatch species Pinnipeds | Type Field study in the wild | Results Acoustic Harassment Devices were not found to be effective in deterring New Zealand fur seals (Arctocephalus forsteri) from mid-water trawls in the New Zealand hoki fishery. Sea Lion Escape Devices are undergoing testing in New Zealand˙s hoki trawl fishery (for fur seals) and the squid trawl fishery (for Hookers˙s sea lion). Preliminary results indicate squid and fish loss via the escape hatch was minimal; in the hoki fishery, fish loss was confined to fast swimming species, including jack mackerel and warehou. |
Location Atlantic |
Gear
Hooks-and-Lines
|
Catch Swordfish and tuna | Technique
Circle hooks
|
Bycatch species Caretta caretta (Loggerhead turtle), Demochelys coriacea (Leatherback sea turtle) | Type Field study in the wild | Results Circle hooks significantly reduce loggerhead (Caretta caretta) and leatherback (Dermocheles coriacea) sea turtle bycatch in Atlantic longline fisheries. Swordfish catch decreased when circle hooks were baited with squid but increased when baited with mackerel. Tuna catch increased when circle hooks were baited with squid but decreased when baited with mackerel. |
Location Azores |
Gear
Hooks-and-Lines
|
Catch Swordfish and blue shark | Technique
Circle hooks
|
Bycatch species Caretta caretta (Loggerhead turtle) | Type Field study in the wild | Results Circle hooks (non-offset 16/0 and 18/0) did not significantly reduce the number of loggerhead sea turtles (Caretta caretta) caught in the Azores longline swordfish and blue shark fishery when compared with non-offset and offset 9/0 J hooks. Use of circle hooks decreased the rate of throat hooking in loggerhead sea turtles. Circle hooks (non-offset 16/0 and 18/0) caught significantly more blue sharks than J hooks in the Azores longline swordfish and blue shark fisheries. Did not reduce bycatch; reduced rate of throat hooking |
Location Azores |
Gear
Hooks-and-Lines
|
Catch Swordfish and blue shark | Technique
Circle hooks
|
Bycatch species Caretta caretta (Loggerhead turtle) | Type Field study in the wild | Results There was no significant difference in the number of loggerhead sea turtles caught in the Azores longline swordfish and blue shark fishery between straight 16/0, offset 16/0, and offset 18/0 circle hooks. Circle hooks decreased the rate of throat hooking in loggerhead sea turtles caught in the Azores longline swordfish and blue shark fishery. Straight 16/0 circle hooks caught the most blue sharks in the Azores longline swordfish and blue shark fishery, followed by offset 18/0 circle hooks. Offset 16/0 circle hooks caught the fewest blue sharks. |
Location Azores |
Gear
Hooks-and-Lines
|
Catch Swordfish and blue shark | Technique
Circle hooks
|
Bycatch species Caretta caretta (Loggerhead turtle) | Type Field study in the wild | Results Japanese tuna hook 3.6mm S/S caught significantly more loggerhead sea turtles than non-offset 16/0 and 18/0 circle hooks and caught more turtles in the throat than the circle hooks in the Azores longline swordfish and blue shark fishery. Non-offset 18/0 circle hooks caught fewer loggerhead sea turtles than non-offset 16/0 circle hooks in the Azores longline swordfish and blue shark fishery. There was no significant difference in the number of blue sharks caught on non-offset 16/0 and 18/0 circle hooks in the Azores longline swordfish and blue shark fishery. Non-offset 16/0 and 18/0 circle hooks caught fewer turtles than Japanese tuna hook. Non-offset 18/0 circle hooks caught fewer turtles than non-offset 16/0 |
Location Azores |
Gear
Hooks-and-Lines
|
Catch Swordfish and blue shark | Technique
Circle hooks
|
Bycatch species Sea Turtles | Type Field study in the wild | Results Circle hooks (non-offset 16/0 and 18/0) caught significantly more blue sharks than J hooks in the Azores longline swordfish and blue shark fisheries. |
Location Atlantic |
Gear
Hooks-and-Lines
|
Catch Swordfish and tuna | Technique
Dyed bait
|
Bycatch species Caretta caretta (Loggerhead turtle), Demochelys coriacea (Leatherback sea turtle) | Type Field study in the wild | Results Blue-dyed bait does not significantly reduce loggerhead (Caretta caretta) and leatherback (Dermocheles coriacea)sea turtle captures in the western Atlantic longline fishery. |
Location Canada |
Gear
Gillnets
|
Catch Multiple species | Technique
Metal oxide/barium sulfate nets
|
Bycatch species Small Cetaceans (maximum length < 7.5 meters), Phocoena phocoena (Harbor porpoise), Seabirds | Type Field study in the wild | Results Metal oxide nets containing barium sulphate (that increased their acoustic reflectivity and probably also their stiffness) reduced the bycatch of harbor porpoise (Phocoena phocoena) in an eastern Canada demersal gillnet fishery. No difference in catch of commercial fish species, including cod, pollock, haddock, and spiny dogfish, was observed between the nylon and barium sulphate nets. Metal oxide nets reduced the bycatch of greater shearwater (Puffinus gravis) in an eastern Canada demersal gillnet fishery, probably by increasing the visibility of the blue-dyed nets to the birds. |