Elasmobranchs

Displaying 11 - 20 of 22

Study Type: 

Field study in the 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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Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

Northern Australia

Target catch: 

Prawns

Effect on bycatch species: 

Reduced the number of sharks and rays by 35% when the Popeye Fishbox was placed 70 meshes from the codend draw strings and by 27% when it was placed 100 meshes from the codend draw strings

Effect on target catch: 

Did not significantly reduce the catch of prawns

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Bycatch species: 

Fishing Gear: 

Study Type: 

Field study in the 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: 

No rays larger than 120 cm were caught when the grid was used

Effect on target catch: 

None reported

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Bycatch species: 

Fishing Gear: 

Study Type: 

Field study in the 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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Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

Bay of Bengal

Target catch: 

Tunas and billfish

Effect on bycatch species: 

J-hooks caught a higer percentage (74.5%) of bycatch compared to target (25.5%) species, while circle hooks caught a similar percentage of each (53.3% and 46.7% respectively). Bycatch catch rates were higher on J-hooks (5.6 individuals/1,000 hooks) than

Effect on target catch: 

Target species catch rates were higher on circle hooks (2.2 individuals/1,000 hooks) compared to J-hooks (1.9 individuals/1,000 hooks). Swordfish caught by J-hooks were slightly larger than those caught on circle hooks.

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Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

Georges Bank

Target catch: 

Swordfish

Effect on bycatch species: 

Signficant differences in catch rates for blue sharks and pelagic stingrays between the two gangions, with more animals being caught on the monofilament gangions. No significant difference was found between gangions for mako sharks.

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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Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

Northern Australia

Target catch: 

Prawns

Effect on bycatch species: 

JT 2 design did not prevent capture of large sharks and rays

Effect on target catch: 

Caught 5.2% more tiger prawns and 6.9% more endeavour prawns than standard net

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Study Type: 

Field study in the wild

Location: 

Northern Australia

Target catch: 

Prawns

Effect on bycatch species: 

JT 1 design did not prevent capture of large sharks and rays

Effect on target catch: 

Caught 6.6% more tiger prawns and 10.5% more endeavour prawns than standard net

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Bycatch species: 

Reduction technique: 

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