Seabirds

Field Study

Study Type: 

wild

Location: 

Eastern Australia

Target catch: 

Tuna

Effect on bycatch species: 

Mainlines with a loose configuration reached depth more slowly than tight configurations, allowing more time for seabirds to become incidentally hooked

Effect on target catch: 

None reported

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Field Study 568

Study Type: 

wild

Location: 

South Africa

Target catch: 

tuna

Effect on bycatch species: 

Catch rates of birds were higher on unweighted compared to weighted branchlines.

Effect on target catch: 

Catch rates of fish were not significantly different between the two branchline types at night or during the dawn.

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Field Study 567

Study Type: 

wild

Location: 

South Africa

Target catch: 

tuna

Effect on bycatch species: 

The mean total attack rate was similar for each design but diving birds attacked further astern in response to both tori line types compared to surface foraging birds. The "hybrid" line did not allow attacks by divers within 50 m but the "light" line al

Effect on target catch: 

None reported

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Chatham Albatross

Species: 

Thalassarche eremita
Photo: Graham Robertson, Australian Antarctic Division
Photo: Graham Robertson, Australian Antarctic Division

Type: 

Bird

Distribution: 

Southeast Pacific; breeds only in a small area of the Chatham Islands of New Zealand

Population: 

Around 5,000 breeding pairs

Bycatch Threat: 

Longlines and trawls

IUCN Status: 

Critically Endangered

Chatham albatross are caught in a variety of longline and trawl fisheries in the southeast Pacific Ocean.  Known mortality from bycatch has been observed in ling demersal and tuna pelagic longline fisheries (Robertson et al 2004) and hake and orange roughy trawl fisheries in the New Zealand Exclusive Economic Zone (EEZ) (Baird 2004a; 2004b).

Field Study 365

Study Type: 

wild

Location: 

Wollongong, Australia

Target catch: 

Tuna

Effect on bycatch species: 

Blue-dyed squid bait reduced subsurface interactions with seabirds by 68%. Seabirds struck only 3-8% of surface blue-dyed squid bait compared with 75-98% of non-dyed squid bait. Birds struck 48% of blue-dyed fish bait at the surface during the first tw

Effect on target catch: 

None reported

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Field Study 359

Study Type: 

wild

Location: 

East Cape, New Zealand

Target catch: 

Bigeye tuna

Effect on bycatch species: 

Results were inconclusive

Effect on target catch: 

No signficiant effect reported for individual species and when all species were combined the results were inconclusive

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Field Study 330

Study Type: 

wild

Location: 

Alaska, Bering Sea

Target catch: 

walleye pollock (Theragra chalcogramma)

Effect on bycatch species: 

Streamers reduced seabird strikes on two cable types

Effect on target catch: 

none

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Reduction technique: 

Fishing Gear: 

ant

Study Type: 

wild

Location: 

Southern Brazil

Target catch: 

Swordfish, blue sharks

Effect on bycatch species: 

Reduced incidental capture of seabirds by 64%

Effect on target catch: 

Increased catch rates of target species (swordfish by 32% and blue sharks by 15.1%)

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Fishing Gear: 

ant

Study Type: 

wild

Location: 

Norway

Target catch: 

Torsk (Brosme brosme), ling (Molva molva) and haddock (Melanogrammus aeglefinus)

Effect on bycatch species: 

Reduced incidental capture of seabirds, mostly fulmars

Effect on target catch: 

Increased target catch rates

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ant

Study Type: 

wild

Location: 

Norway

Target catch: 

Torsk (Brosme brosme), ling (Molva molva) and haddock (Melanogrammus aeglefinus)

Effect on bycatch species: 

Reduced incidental capture of seabirds, mostly fulmars

Effect on target catch: 

Increased target catch rates

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