Sharks

Field Study 319

Study Type: 

wild

Location: 

North Carolina

Target catch: 

Spanish mackerel, menhaden, spot

Effect on bycatch species: 

Significantly less blacktip sharks were wrapped in the 3" modified net

Effect on target catch: 

Did not reduce catch rates

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Field Study 318

Study Type: 

wild

Location: 

North Carolina

Target catch: 

Spanish mackerel, menhaden, spot

Effect on bycatch species: 

The proportion of hammer-wrapped bonnethead sharks was significantly higher in the 4" unmodified net

Effect on target catch: 

Did not reduce catch rates

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Field Study 317

Study Type: 

wild

Location: 

North Carolina

Target catch: 

Spanish mackerel, menhaden, spot

Effect on bycatch species: 

Catch rates of bonnethead sharks were significantly lower in the 4" modified net

Effect on target catch: 

Did not reduce catch rates

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Field Study 305

Study Type: 

wild

Location: 

Western Australia

Target catch: 

Red emperor, scarlet perch, spangled emperor, Rankin cod, blue spot emperor, rosy threadfin brea, flagfish, frypan snapper, red snapper and goldband snapper

Effect on bycatch species: 

Reduced capture of sharks larger than 100 cm with largest reductions occuring at lengths greater than 180 cm

Effect on target catch: 

None reported

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ant

Study Type: 

wild

Location: 

Northeastern Australia

Target catch: 

Bigeye and yellowfin tuna

Effect on bycatch species: 

Wire leaders had higher catch rates of sharks when compared to nylon monofilament leaders

Effect on target catch: 

Nylon monofilament leaders had higher catch rates of bigeye tunas when compared to wire leaders, but had no effect on yellowfin catch

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Study Type: 

wild

Location: 

North Carolina, USA

Target catch: 

Spanish mackerel and spot

Effect on bycatch species: 

Significantly reduced bycatch of some shark species

Effect on target catch: 

No difference in similar mesh size in Spanish mackerel fishery or the spot fishery. The trend was for higher catch rates in modified nets in the spot fishery.

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Field investigation of rare-earth metal as a deterrent to spiny dogfish in the Pacific halibut fishery

Study Type: 

wild

Location: 

Alaska

Target catch: 

Pacific halibut

Effect on bycatch species: 

Slightly reduced bycatch of spiny dogfish

Effect on target catch: 

Did not affect catch of halibut

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Effects of eliminating shallow hooks from tuna longline sets on target and non-target species in the Hawaii-based pelagic tuna fishery

Study Type: 

wild

Location: 

Hawaii

Target catch: 

Tuna and swordfish

Effect on bycatch species: 

No differences in catches between experimental and control sets

Effect on target catch: 

Decreased catch of wahoo, dolphinfish, blue and striped marlin, and shortbill species, increased catch of sickle pomfret and opah, and did not affect catch of sharks and pelagic sting rays

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