Seabirds

Integrated weight longlines with paired streamer lines - best practice to prevent seabird bycatch in demersal longline

Study Type: 

wild

Location: 

Bering Sea

Target catch: 

Pacific cod

Effect on bycatch species: 

Integrated weight longlines paired with streamer lines eliminated surface foraging and shearwater catch by 97%; integrated weigh longlines reduced surface forager catch rates by 91% and unweighted longlines with paired streamer by 98%

Effect on target catch: 

Target catch rates were not affected

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Canadian fisheryclosures provide a large-scale test of the impact of gillnet bycatch on seabird populations

Study Type: 

summary

Location: 

Canada

Target catch: 

Cod and Atlantic salmon

Effect on bycatch species: 

Closure resulted in increased populations of common murres and auks but a decrease in gulls

Effect on target catch: 

None reported

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Field Study

Study Type: 

wild

Location: 

Uruguay

Target catch: 

swordfish, tuna, sharks

Effect on bycatch species: 

Time of year was the largest predictor of interaction between great albatross and longliners

Effect on target catch: 

n/a

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Field Study

Study Type: 

wild

Location: 

South Africa EEZ

Target catch: 

Tuna and swordfish

Effect on bycatch species: 

Combination of bird-scaring lines, weighted lines, and night sets yielded zero moralities.

Effect on target catch: 

No effect

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Field Study 815

Study Type: 

wild

Location: 

South Africa

Target catch: 

Tuna

Effect on bycatch species: 

0.439 birds/1000 hooks (night) vs. 2 birds/1000 hooks (day)

Effect on target catch: 

None reported

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