Search The Database
| Location | Gear | Catch | Technique | Bycatch species | Type | Results |
|---|---|---|---|---|---|---|
Atlantic and Gulf of Mexico |
Trawls
|
shrimp |
Excluder devices
|
Sea Turtles | Field study in the wild | Turtle Excluder Devices reduce sea turtle bycatch in the Atlantic and Gulf of Mexico shrimp trawl fishery. |
New Zealand |
Trawls
|
Hoki | Pinnipeds | Field study in the wild | 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. |
|
New Zealand |
Trawls
|
Hoki |
Excluder devices
|
Pinnipeds | Field study in the wild | 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. |
Atlantic |
Hooks-and-Lines
|
Swordfish and tuna |
Circle hooks
|
Caretta caretta (Loggerhead turtle), Demochelys coriacea (Leatherback sea turtle) | Field study in the wild | 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. |
Azores |
Hooks-and-Lines
|
Swordfish and blue shark |
Circle hooks
|
Caretta caretta (Loggerhead turtle) | Field study in the wild | 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 |
Azores |
Hooks-and-Lines
|
Swordfish and blue shark |
Circle hooks
|
Caretta caretta (Loggerhead turtle) | Field study in the wild | 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. |
Azores |
Hooks-and-Lines
|
Swordfish and blue shark |
Circle hooks
|
Caretta caretta (Loggerhead turtle) | Field study in the wild | 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 |
Azores |
Hooks-and-Lines
|
Swordfish and blue shark |
Circle hooks
|
Sea Turtles | Field study in the wild | 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. |
Atlantic |
Hooks-and-Lines
|
Swordfish and tuna |
Dyed bait
|
Caretta caretta (Loggerhead turtle), Demochelys coriacea (Leatherback sea turtle) | Field study in the wild | Blue-dyed bait does not significantly reduce loggerhead (Caretta caretta) and leatherback (Dermocheles coriacea)sea turtle captures in the western Atlantic longline fishery. |
Canada |
Gillnets
|
Multiple species |
Metal oxide/barium sulfate nets
|
Small Cetaceans (maximum length < 7.5 meters), Phocoena phocoena (Harbor porpoise), Seabirds | Field study in the wild | 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. |