Caretta caretta (Loggerhead turtle)

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

Study Type: 

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.

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

Study Type: 

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

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

Study Type: 

wild

Location: 

Azores

Target catch: 

Swordfish and blue shark

Effect on bycatch species: 

Circle hooks resulted in fewer turtles being caught in the throat

Effect on target catch: 

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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: 

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.

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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: 

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.

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Fishing methods to reduce sea turtle mortality associated with pelagic longlines

Study Type: 

wild

Location: 

NW Atlantic

Target catch: 

swordfish and tuna

Effect on bycatch species: 

Reduced interactions

Effect on target catch: 

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Food color and marine turtle feeding behavior: Can blue bait reduce turtle bycatch in commercial fisheries?

Study Type: 

wild

Location: 

Costa Rica

Target catch: 

swordfish and tuna

Effect on bycatch species: 

Reduced interactions

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Field Study 723

Study Type: 

wild

Location: 

Western North Atlantic

Target catch: 

Swordfish and tuna

Effect on bycatch species: 

Circle hooks decreased loggerhead and leatherback catch; even more effective for loggerheads when combined with mackerel bait

Effect on target catch: 

Circle hooks combined with mackerel bait increased swordfish catch by weight. With squid, decreased swordfish catch, increased bluefin and albacore tuna catch. Mackerel bait decreased bigeye and albacore tuna catch.

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Field Study

Study Type: 

wild

Location: 

Central Mediterranean Sea

Target catch: 

swordfish

Effect on bycatch species: 

Circle hooks captured fewer (2) loggerheads compared to 2J hooks (9)

Effect on target catch: 

16/0 hooks resulted in a non-statistically significant decrease in catchability compared to size 2 J hooks, but statistically significant decrease compared to size 4 and 5 J hooks

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