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A comparison of circle hook and J hook performance in a western equatorial Atlantic Ocean pelagic longline fishery

Study Type
Field study in the wild
Location
Equatorial Atlantic Ocean
Target catch
Tuna
Effect on bycatch species
Sailfish, pelagic stingrays, and leatherback sea turtles, had higher catch rates on J-style hooks
Effect on target catch
Bigeye and yellowfin tuna had higher survival rates when circle hooks were used
Bycatch species
Bony Fishes
Skates/Rays
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

A comparison of circle hook and J hook performance in a western equatorial Atlantic Ocean pelagic longline fishery

Study Type
Field study in the wild
Location
Equatorial Atlantic Ocean
Target catch
Tuna
Effect on bycatch species
Sailfish, pelagic stingrays, and leatherback sea turtles, had higher catch rates on J-style hooks
Effect on target catch
Bigeye and yellowfin tuna had higher survival rates when circle hooks were used
Bycatch species
Bony Fishes
Skates/Rays
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

A comparison of circle hook and J hook performance in a western equatorial Atlantic Ocean pelagic longline fishery

Study Type
Field study in the wild
Location
Equatorial Atlantic Ocean
Target catch
Tuna
Effect on bycatch species
Catch rates were lower for leatherback sea turtles and pelagic stingrays but not sailfish when circle hooks were used
Effect on target catch
Bigeye tuna had higher catch rates when circle hooks were used
Bycatch species
Bony Fishes
Skates/Rays
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

A comparison of circle hook and J hook performance in a western equatorial Atlantic Ocean pelagic longline fishery

Study Type
Field study in the wild
Location
Equatorial Atlantic Ocean
Target catch
Tuna
Effect on bycatch species
Catch rates were lower for leatherback sea turtles and pelagic stingrays but not sailfish when circle hooks were used
Effect on target catch
Bigeye tuna had higher catch rates when circle hooks were used
Bycatch species
Bony Fishes
Skates/Rays
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

A comparison of circle hook and J hook performance in a western equatorial Atlantic Ocean pelagic longline fishery

Study Type
Field study in the wild
Location
Equatorial Atlantic Ocean
Target catch
Tuna
Effect on bycatch species
Catch rates were lower for leatherback sea turtles and pelagic stingrays but not sailfish when circle hooks were used
Effect on target catch
Bigeye tuna had higher catch rates when circle hooks were used
Bycatch species
Bony Fishes
Skates/Rays
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

A comparison of circle hook and J hook performance in a western equatorial Atlantic Ocean pelagic longline fishery

Study Type
Field study in the wild
Location
Equatorial Atlantic Ocean
Target catch
Tuna
Effect on bycatch species
Catch rates were lower for leatherback sea turtles and pelagic stingrays but not sailfish when circle hooks were used
Effect on target catch
Bigeye tuna had higher catch rates when circle hooks were used
Bycatch species
Bony Fishes
Skates/Rays
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

A comparison of circle hook and J hook performance in a western equatorial Atlantic Ocean pelagic longline fishery

Study Type
Field study in the wild
Location
Equatorial Atlantic Ocean
Target catch
Tuna
Effect on bycatch species
Catch rates were lower for leatherback sea turtles and pelagic stingrays but not sailfish when circle hooks were used
Effect on target catch
Bigeye tuna had higher catch rates when circle hooks were used
Bycatch species
Bony Fishes
Skates/Rays
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Fishing gear modifications to reduce elasmobranch mortality in pelagic and bottom longline fisheries off Northeast Brazil

Study Type
Field study in the wild
Location
Brazil
Target catch
Tuna (pelagic) sharks (bottom)
Effect on bycatch species
Mortality at haulback was significantly higher for on J-hooks.
Bycatch species
Sharks
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Fishing gear modifications to reduce elasmobranch mortality in pelagic and bottom longline fisheries off Northeast Brazil

Study Type
Field study in the wild
Location
Brazil
Target catch
Tuna (pelagic) sharks (bottom)
Effect on bycatch species
Mortality at haulback was significantly higher for on J-hooks.
Bycatch species
Sharks
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Fishing gear modifications to reduce elasmobranch mortality in pelagic and bottom longline fisheries off Northeast Brazil

Study Type
Field study in the wild
Location
Brazil
Target catch
Tuna (pelagic) sharks (bottom)
Effect on bycatch species
Mortality at haulback was significantly higher for on J-hooks.
Bycatch species
Sharks
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Fishing gear modifications to reduce elasmobranch mortality in pelagic and bottom longline fisheries off Northeast Brazil

Study Type
Field study in the wild
Location
Brazil
Target catch
Tuna (pelagic) sharks (bottom)
Effect on bycatch species
Rates of external hooking were significantly higher with circle hooks
Bycatch species
Elasmobranchs
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Fishing gear modifications to reduce elasmobranch mortality in pelagic and bottom longline fisheries off Northeast Brazil

Study Type
Field study in the wild
Location
Brazil
Target catch
Tuna (pelagic) sharks (bottom)
Effect on bycatch species
Rates of external hooking were significantly higher with circle hooks
Bycatch species
Elasmobranchs
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Fishing gear modifications to reduce elasmobranch mortality in pelagic and bottom longline fisheries off Northeast Brazil

Study Type
Field study in the wild
Location
Brazil
Target catch
Tuna (pelagic) sharks (bottom)
Effect on bycatch species
Rates of external hooking were significantly higher with circle hooks
Bycatch species
Elasmobranchs
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Circle hook effectiveness for the mitigation of sea turtle bycatch and capture of target species in a Brazilian pelagic longline fishery

Study Type
Field study in the wild
Location
South-western Atlantic Ocean
Target catch
Tuna, blue sharks, swordfish
Effect on bycatch species
De-hooking was decreased from 25% to 5.8% in loggerhead sea turtles when circle hooks were used.
Bycatch species
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Circle hook effectiveness for the mitigation of sea turtle bycatch and capture of target species in a Brazilian pelagic longline fishery

Study Type
Field study in the wild
Location
South-western Atlantic Ocean
Target catch
Tuna, blue sharks, swordfish
Effect on bycatch species
De-hooking was decreased from 25% to 5.8% in loggerhead sea turtles when circle hooks were used.
Bycatch species
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Circle hook effectiveness for the mitigation of sea turtle bycatch and capture of target species in a Brazilian pelagic longline fishery

Study Type
Field study in the wild
Location
South-western Atlantic Ocean
Target catch
Tuna, blue sharks, swordfish
Effect on bycatch species
De-hooking was decreased from 25% to 5.8% in loggerhead sea turtles when circle hooks were used.
Bycatch species
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Circle hook effectiveness for the mitigation of sea turtle bycatch and capture of target species in a Brazilian pelagic longline fishery

Study Type
Field study in the wild
Location
South-western Atlantic Ocean
Target catch
Tuna, blue sharks, swordfish
Effect on bycatch species
De-hooking was decreased from 25% to 5.8% in loggerhead sea turtles when circle hooks were used.
Bycatch species
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Development and observations of spiny dogfish Squalus acanthias reduction device in a raised footrope silver hake Merluccius bilinearis trawl

Study Type
Field study in the wild
Location
Massachusetts Bay
Target catch
Silver hake
Effect on bycatch species
There were no observed differences in the behavior of spiny dogfish between gear configurations or grate colors.
Bycatch species
Sharks
Reduction technique
Excluder devices
Fishing Gear
Trawls

Development and observations of spiny dogfish Squalus acanthias reduction device in a raised footrope silver hake Merluccius bilinearis trawl

Study Type
Field study in the wild
Location
Massachusetts Bay
Target catch
Silver hake
Effect on bycatch species
There were no observed differences in the behavior of spiny dogfish between gear configurations or grate colors.
Bycatch species
Sharks
Reduction technique
Excluder devices
Fishing Gear
Trawls

Development and observations of spiny dogfish Squalus acanthias reduction device in a raised footrope silver hake Merluccius bilinearis trawl

Study Type
Field study in the wild
Location
Massachusetts Bay
Target catch
Silver hake
Effect on bycatch species
There were no observed differences in the behavior of spiny dogfish between gear configurations or grate colors.
Bycatch species
Sharks
Reduction technique
Excluder devices
Fishing Gear
Trawls
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