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Field Study 567

Study Type
Field study in the wild
Location
South Africa
Target catch
tuna
Effect on bycatch species
The mean total attack rate was similar for each design but diving birds attacked further astern in response to both tori line types compared to surface foraging birds. The "hybrid" line did not allow attacks by divers within 50 m but the "light" line al
Effect on target catch
None reported
Bycatch species
Seabirds
Reduction technique
Bird-scaring devices
Fishing Gear
Hooks-and-Lines

Field Study 567

Study Type
Field study in the wild
Location
South Africa
Target catch
tuna
Effect on bycatch species
The mean total attack rate was similar for each design but diving birds attacked further astern in response to both tori line types compared to surface foraging birds. The "hybrid" line did not allow attacks by divers within 50 m but the "light" line al
Effect on target catch
None reported
Bycatch species
Seabirds
Reduction technique
Bird-scaring devices
Fishing Gear
Hooks-and-Lines

Field Study 567

Study Type
Field study in the wild
Location
South Africa
Target catch
tuna
Effect on bycatch species
The mean total attack rate was similar for each design but diving birds attacked further astern in response to both tori line types compared to surface foraging birds. The "hybrid" line did not allow attacks by divers within 50 m but the "light" line al
Effect on target catch
None reported
Bycatch species
Seabirds
Reduction technique
Bird-scaring devices
Fishing Gear
Hooks-and-Lines

Field Study 570

Study Type
Field study in the wild
Location
South-western Atlantic Ocean
Target catch
Tuna, blue sharks, swordfish
Effect on bycatch species
The incidental capture of loggerhead sea turtles was reduced by 55% and for leatherback sea turtles by 65% when circle hooks were used.
Effect on target catch
Catch rates of targeted species including bigeye and albacore tuna and blue sharks were increased with the use of circle hooks, while no difference was found for yellowfin tuna, shortfin mako or hammerhead sharks or for dolphinfish.
Bycatch species
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 570

Study Type
Field study in the wild
Location
South-western Atlantic Ocean
Target catch
Tuna, blue sharks, swordfish
Effect on bycatch species
The incidental capture of loggerhead sea turtles was reduced by 55% and for leatherback sea turtles by 65% when circle hooks were used.
Effect on target catch
Catch rates of targeted species including bigeye and albacore tuna and blue sharks were increased with the use of circle hooks, while no difference was found for yellowfin tuna, shortfin mako or hammerhead sharks or for dolphinfish.
Bycatch species
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 570

Study Type
Field study in the wild
Location
South-western Atlantic Ocean
Target catch
Tuna, blue sharks, swordfish
Effect on bycatch species
The incidental capture of loggerhead sea turtles was reduced by 55% and for leatherback sea turtles by 65% when circle hooks were used.
Effect on target catch
Catch rates of targeted species including bigeye and albacore tuna and blue sharks were increased with the use of circle hooks, while no difference was found for yellowfin tuna, shortfin mako or hammerhead sharks or for dolphinfish.
Bycatch species
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 570

Study Type
Field study in the wild
Location
South-western Atlantic Ocean
Target catch
Tuna, blue sharks, swordfish
Effect on bycatch species
The incidental capture of loggerhead sea turtles was reduced by 55% and for leatherback sea turtles by 65% when circle hooks were used.
Effect on target catch
Catch rates of targeted species including bigeye and albacore tuna and blue sharks were increased with the use of circle hooks, while no difference was found for yellowfin tuna, shortfin mako or hammerhead sharks or for dolphinfish.
Bycatch species
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 574

Study Type
Field study in the wild
Location
northwest Pacific Ocean
Target catch
Pelagic species
Effect on bycatch species
None reported
Effect on target catch
There were no significant differences in catch rates between hook types but squid bait caught significantly more blue and silky sharks and dolphinfish.
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 574

Study Type
Field study in the wild
Location
northwest Pacific Ocean
Target catch
Pelagic species
Effect on bycatch species
None reported
Effect on target catch
There were no significant differences in catch rates between hook types but squid bait caught significantly more blue and silky sharks and dolphinfish.
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field Study 586

Study Type
Field study in the wild
Location
Mid Atlantic Bight
Target catch
Longfin squid
Effect on bycatch species
The square-mesh escape panel significantly reduced the average catches of scup and black sea bass. The panel also reduced catches of sublegal-size scup and black sea bass.
Effect on target catch
Longfin squid catch was reduced by 88% and 84% in numbers and weight respectively.
Bycatch species
Bony Fishes
Reduction technique
Excluder devices
Fishing Gear
Trawls
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