Circle hooks

A circular hook design in which the point of the hook is perpendicular to the hook shank. Circle hooks are used widely in many recreational and commercial fisheries and recently have been shown to reduce both the hooking rate and the mortality of turtles that are hooked on pelagic longline gear. As a result of several successful field trials (Bolten and Bjorndal, 2005; Watson et al., 2005), these hooks are becoming increasingly used in longline fisheries.

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Study Type: 

Field study in the wild

Location: 

Strait of Sicily

Target catch: 

Swordfish

Effect on bycatch species: 

Circle hooks reduced the incidental capture of immature sea turtles

Effect on target catch: 

Circle hooks did not affect catch rates or the size of the targeted catch

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

off Hawaii

Target catch: 

Swordfish

Effect on bycatch species: 

Highly significant reduction in the proportion of turtles that swallowed hooks

Effect on target catch: 

Swordfish catch increased by 16%, tuna catch decreased by 50%, and mahi-mahi, opah, and wahoo catch decreased by 34%

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

off Hawaii

Target catch: 

Swordfish

Effect on bycatch species: 

Leatherback turtle capture rates declined by 83% and loggerhead capture rates declined by 90%

Effect on target catch: 

Swordfish catch increased by 16%, tuna catch decreased by 50%, and mahi-mahi, opah, and wahoo catch decreased by 34%

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

Azores

Target catch: 

Swordfish and blue shark

Effect on bycatch species: 

Non-offset 16/0 and 18/0 circle hooks caught fewer turtles than Japanese tuna hook. Non-offset 18/0 circle hooks caught fewer turtles than non-offset 16/0

Effect on target catch: 

There was no significant difference in the number of blue sharks caught on non-offset 16/0 and 18/0 circle hooks .

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

Azores

Target catch: 

Swordfish and blue shark

Effect on bycatch species: 

Decreased throat hooking

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

Azores

Target catch: 

Swordfish and blue shark

Effect on bycatch species: 

Did not reduce bycatch; reduced rate of throat hooking

Effect on target catch: 

Increased blue shark catch when compared to J hooks

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

United States

Target catch: 

Swordfish

Effect on bycatch species: 

Reduced bycatch and hook ingestion

Effect on target catch: 

No negative effect

Article: 

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