Elasmobranchs

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Fishing gear modifications to reduce elasmobranch mortality in pelagic and bottom longline fisheries off Northeast Brazil

Study Type: 

Field study in the wild

Location: 

Brazil

Target catch: 

Tuna (pelagic) sharks (bottom)

Effect on bycatch species: 

Rates of external hooking were significantly higher with circle hooks

Article: 

Fishing gear modifications to reduce elasmobranch mortality in pelagic and bottom longline fisheries off Northeast Brazil

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Field Study

Study Type: 

Field study in the wild

Location: 

Central Pacific

Target catch: 

pelagic sharks and fishes

Effect on bycatch species: 

examining rates of post-release mortality from longline gear

Effect on target catch: 

examined in other research

Bycatch species: 

Fishing Gear: 

Field Study 739

Study Type: 

Field study in the wild

Location: 

South Carolina

Target catch: 

None reported

Effect on bycatch species: 

Neodymium-iron-boron magnets significantly reduced catches of Atlantic sharpnose shark and smooth dogfish.

Effect on target catch: 

There were no differences in the catch rates of several fish species, including Atlantic croaker, oyster toadfish, black sea bass and bluefish when magnets were used.

Article: 

Analysis of permanent magnets as elasmobranch bycatch reduction devices in hook-and-line longline trials

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Field Study 723

Study Type: 

Field study in the 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: 

Evaluation of hook and bait type on the catch rates in the western North Atlantic Ocean pelagic longline fishery

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Field Study 705

Study Type: 

Field study in the wild

Location: 

Southwest Atlantic

Target catch: 

Tuna

Effect on bycatch species: 

American style longlines - no significant difference in catch rates for blue or porbeagle sharks, seabirds or sea turtles. Spanish style longline - significant decrease in pelagic stingray catch rates on circle hooks, no significant differences in catch

Effect on target catch: 

Albacore catches increased with circle hooks on both types of longline. Shortfin mako shark catch rates increased with circle hooks on the American style longlines.

Article: 

Circle hook performance in the Uruguayan pelagic longline fishery

Bycatch species: 

Reduction technique: 

Fishing Gear: 

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