Bony Fishes

Field Study

Study Type: 

wild

Location: 

US Mid-Atlantic

Target catch: 

Monkfish

Effect on bycatch species: 

No effect on Atlantic sturgeon; increased common dolphin bycatch

Effect on target catch: 

Removing tie-downs decreased monkfish landings

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Field Study 615

Study Type: 

wild

Location: 

New South Wales Australia

Target catch: 

Prawns

Effect on bycatch species: 

The Nordmore-grid codend caught 50% fewer yellowfin bream than the radial escape section net and 55% fewer than the control net. Both trial codends significantly reduced the predicted mean weight (36% Nordmore-grid and 74.3% radial escape section) and n

Effect on target catch: 

The codend with a radial escape section and the simplified Nordmore-grid retained fewer school prawns by weight 11.5% and 4.6% resepectively, compared to the control net.

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Field Study 609

Study Type: 

wild

Location: 

Gulf of California

Target catch: 

Shrimp

Effect on bycatch species: 

The industrial version of the prototype reduced bycatch-to-shrimp ratios from 20-50% and the artisanal version also reduced the bycatch-to-shrimp ratios.

Effect on target catch: 

The industrial prototype increased target catch efficiency

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Field Study 605

Study Type: 

wild

Location: 

eastern Pacific Ocean

Target catch: 

Tuna

Effect on bycatch species: 

Significant differences between J and circle hook size 15 and between J and circle hook size 16 were found in the bycatch species group (all species grouped together). Chub mackerel bait caught the sharks.

Effect on target catch: 

No significant differences in catch rates of the target species were found between hook types. The highest catch rates for tunas were found on circle hooks size 15. Squid and jack mackerel bait had the highest catch rates for tunas.

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Field Study 586

Study Type: 

wild

Location: 

Mid Atlantic Bight

Target catch: 

Longfin squid

Effect on bycatch species: 

The square-mesh escape panel significantly reduced the average catches of scup and black sea bass. The panel also reduced catches of sublegal-size scup and black sea bass.

Effect on target catch: 

Longfin squid catch was reduced by 88% and 84% in numbers and weight respectively.

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Field Study 540

Study Type: 

wild

Location: 

Hawaii

Target catch: 

Bigeye tuna

Effect on bycatch species: 

Statistically more sickle pomfret and fewer wahoo, dolphinfish, blue marlin, striped marlin and shortbill spearfish were caught on the experimental compared to the control sets

Effect on target catch: 

No significant differences in catch rates between the two set types was found

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Field Study 538

Study Type: 

wild

Location: 

Florida

Target catch: 

Shrimp

Effect on bycatch species: 

Florida fisheye bycatch reduction device (BRD) did not significantly reduce finfish bycatch. The large-mesh extended-mesh funnel BRD significantly reduced bycatch. The simulator cone (used with both BRD's) significantly reduced bycatch.

Effect on target catch: 

Florida fisheye BRD retained shrimp. The large-mesh extended-mesh funnel BRD had low shrimp loss at Tarpon Springs but at Biscayne Bay shrimp loss was significant. The simulator cone (used with both BRD's) resulted in significant shrimp loss.

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Field Study 536

Study Type: 

wild

Location: 

Hawaii

Target catch: 

Bigeye tuna

Effect on bycatch species: 

Catch rates on circle hooks were significantly lower than on Japanese style and "J" hooks for 16 and 8 species respectively. Fish length was significantly shorter for four species on Japanese style hooks and for three species on "J" hooks. Survival was

Effect on target catch: 

There were no significant differences in catch, catch rate or mean length for bigeye tunas. Survival was significantly higher for bigeye tuna caught on circle vs. Japanese style hooks.

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Field Study 362

Study Type: 

wild

Location: 

Georges Bank

Target catch: 

Swordfish

Effect on bycatch species: 

No signficant difference in catch rates between gangions for white marlin.

Effect on target catch: 

There were no differences in the mean length at capture, but signficantly more swordfish were caught on the monofilament gangions.

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