Elasmobranchs

Field Study

Study Type: 

lab

Location: 

Macduff Marine Aquarium, UK

Target catch: 

n/a

Effect on bycatch species: 

Species significantly avoided magnets

Effect on target catch: 

n/a

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Field Study

Study Type: 

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

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Field Study 844

Study Type: 

wild

Location: 

Venezuela

Target catch: 

shrimp

Effect on bycatch species: 

Decrease of 26-32%

Effect on target catch: 

Maintained or increased

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Field Study

Study Type: 

wild

Location: 

South Carolina

Target catch: 

None reported

Effect on bycatch species: 

Barium-ferrite magnets significantly reduced catches of blacktip sharks and southern stingrays.

Effect on target catch: 

No impact on teleosts

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Field Study 739

Study Type: 

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.

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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 705

Study Type: 

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.

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Field Study

Study Type: 

wild

Location: 

Western and Central Pacific Ocean

Target catch: 

Tuna

Effect on bycatch species: 

Only two out of 105 silky sharks were able to escape through the release panel. No finfish species escaped.

Effect on target catch: 

None reported

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