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Experiments in the western Atlantic Northeast Distant Waters to evaluate sea turtle mitigation measures in the pelagic longline fishery. Report on experiments conducted in 2001-2003.

Study Type
Field study in the wild
Location
Atlantic
Target catch
swordfish and tuna
Effect on bycatch species
Reduced interactions
Effect on target catch
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.
Bycatch species
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Alternative bait
Fishing Gear
Hooks-and-Lines

Experiments in the western Atlantic Northeast Distant Waters to evaluate sea turtle mitigation measures in the pelagic longline fishery. Report on experiments conducted in 2001-2003.

Study Type
Field study in the wild
Location
Atlantic
Target catch
swordfish and tuna
Effect on bycatch species
Reduced interactions
Effect on target catch
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.
Bycatch species
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Alternative bait
Fishing Gear
Hooks-and-Lines

Experiments in the western Atlantic Northeast Distant Waters to evaluate sea turtle mitigation measures in the pelagic longline fishery. Report on experiments conducted in 2001-2003.

Study Type
Field study in the wild
Location
Atlantic
Target catch
swordfish and tuna
Effect on bycatch species
Reduced interactions
Effect on target catch
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.
Bycatch species
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Alternative bait
Fishing Gear
Hooks-and-Lines

Experiments in the western Atlantic Northeast Distant Waters to evaluate sea turtle mitigation measures in the pelagic longline fishery. Report on experiments conducted in 2001-2003.

Study Type
Field study in the wild
Location
Atlantic
Target catch
swordfish and tuna
Effect on bycatch species
Reduced interactions
Effect on target catch
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.
Bycatch species
Caretta caretta (Loggerhead turtle)
Demochelys coriacea (Leatherback sea turtle)
Reduction technique
Alternative bait
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 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
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