Demochelys coriacea (Leatherback sea turtle)

Marine animal entanglements in mussel aquaculture gear: Documented cases from mussel farming regions of the world including first-hand accounts from Iceland

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.

Effect on target catch: 

Reduction technique: 

Bycatch species: 

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

Study Type: 

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

Article: 

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Reduction technique: 

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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.

Article: 

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Reduction technique: 

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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: 

Article: 

Reduction technique: 

Bycatch species: 

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

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

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.

Article: 

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Field Study 570

Study Type: 

wild

Location: 

South-western Atlantic Ocean

Target catch: 

Tuna, blue sharks, swordfish

Effect on bycatch species: 

The incidental capture of loggerhead sea turtles was reduced by 55% and for leatherback sea turtles by 65% when circle hooks were used.

Effect on target catch: 

Catch rates of targeted species including bigeye and albacore tuna and blue sharks were increased with the use of circle hooks, while no difference was found for yellowfin tuna, shortfin mako or hammerhead sharks or for dolphinfish.

Reduction technique: 

Bycatch species: 

Fishing Gear: 

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

Study Type: 

wild

Location: 

Atlantic

Target catch: 

Swordfish and tuna

Effect on bycatch species: 

Did not reduce bycatch

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

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 bycatch

Effect on target catch: 

Effect varied by species and by bait

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

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