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Experiment to Evaluate Gear Modification on Rates of Sea Turtle Bycatch in the Swordfish Longline Fishery in the Azores Phase 3

Study Type
Field study in the wild
Location
Azores
Target catch
Swordfish and blue shark
Effect on bycatch species
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.
Effect on target catch
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.
Bycatch species
Caretta caretta (Loggerhead turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Experiment to Evaluate Gear Modification on Rates of Sea Turtle Bycatch in the Swordfish Longline Fishery in the Azores Phase 3

Study Type
Field study in the wild
Location
Azores
Target catch
Swordfish and blue shark
Effect on bycatch species
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.
Effect on target catch
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.
Bycatch species
Caretta caretta (Loggerhead turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Experiment to Evaluate Gear Modification on Rates of Sea Turtle Bycatch in the Swordfish Longline Fishery in the Azores Phase 3

Study Type
Field study in the wild
Location
Azores
Target catch
Swordfish and blue shark
Effect on bycatch species
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.
Effect on target catch
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.
Bycatch species
Caretta caretta (Loggerhead turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Experiment to Evaluate Gear Modification on Rates of Sea Turtle Bycatch in the Swordfish Longline Fishery in the Azores Phase 4

Study Type
Field study in the wild
Location
Azores
Target catch
Swordfish and blue shark
Effect on bycatch species
Circle hooks resulted in fewer turtles being caught in the throat
Bycatch species
Caretta caretta (Loggerhead turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Experiment to Evaluate Gear Modification on Rates of Sea Turtle Bycatch in the Swordfish Longline Fishery in the Azores Phase 4

Study Type
Field study in the wild
Location
Azores
Target catch
Swordfish and blue shark
Effect on bycatch species
Circle hooks resulted in fewer turtles being caught in the throat
Bycatch species
Caretta caretta (Loggerhead turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Experiment to Evaluate Gear Modification on Rates of Sea Turtle Bycatch in the Swordfish Longline Fishery in the Azores Phase 4

Study Type
Field study in the wild
Location
Azores
Target catch
Swordfish and blue shark
Effect on bycatch species
Circle hooks resulted in fewer turtles being caught in the throat
Bycatch species
Caretta caretta (Loggerhead turtle)
Reduction technique
Circle hooks
Fishing Gear
Hooks-and-Lines

Field investigation of rare-earth metal as a deterrent to spiny dogfish in the Pacific halibut fishery

Study Type
Field study in the wild
Location
Alaska
Target catch
Pacific halibut
Effect on bycatch species
Experimental hooks resulted in greater reduction on catch of longnose skate
Effect on target catch
Did not affect catches
Bycatch species
Skates/Rays
Reduction technique
Electromagnetic deterrents
Fishing Gear
Hooks-and-Lines

Field investigation of rare-earth metal as a deterrent to spiny dogfish in the Pacific halibut fishery

Study Type
Field study in the wild
Location
Alaska
Target catch
Pacific halibut
Effect on bycatch species
Experimental hooks resulted in greater reduction on catch of longnose skate
Effect on target catch
Did not affect catches
Bycatch species
Skates/Rays
Reduction technique
Electromagnetic deterrents
Fishing Gear
Hooks-and-Lines

Field investigation of rare-earth metal as a deterrent to spiny dogfish in the Pacific halibut fishery

Study Type
Field study in the wild
Location
Alaska
Target catch
Pacific halibut
Effect on bycatch species
Experimental hooks resulted in greater reduction on catch of longnose skate
Effect on target catch
Did not affect catches
Bycatch species
Skates/Rays
Reduction technique
Electromagnetic deterrents
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

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
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