Unanswered Forum Topics

Are circle hooks effective in reducing incidental captures of loggerhead sea turtles in a Mediterranean longline fishery?

Study Type
Field study in the wild
Location
Strait of Sicily
Target catch
Swordfish
Effect on bycatch species
J hooks resulted in more hooks being swallowed compared to circle hooks
Effect on target catch
None reported
Bycatch species
Caretta caretta (Loggerhead turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Are circle hooks effective in reducing incidental captures of loggerhead sea turtles in a Mediterranean longline fishery?

Study Type
Field study in the wild
Location
Strait of Sicily
Target catch
Swordfish
Effect on bycatch species
J hooks resulted in more hooks being swallowed compared to circle hooks
Effect on target catch
None reported
Bycatch species
Caretta caretta (Loggerhead turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Are circle hooks effective in reducing incidental captures of loggerhead sea turtles in a Mediterranean longline fishery?

Study Type
Field study in the wild
Location
Strait of Sicily
Target catch
Swordfish
Effect on bycatch species
J hooks resulted in more hooks being swallowed compared to circle hooks
Effect on target catch
None reported
Bycatch species
Caretta caretta (Loggerhead 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
Swordfish and sailfish had significantly higher external hookings when circle hooks were used
Bycatch species
Bony Fishes
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
Swordfish and sailfish had significantly higher external hookings when circle hooks were used
Bycatch species
Bony Fishes
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
Swordfish and sailfish had significantly higher external hookings when circle hooks were used
Bycatch species
Bony Fishes
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
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
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
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