Seabirds

Displaying 11 - 20 of 69

Study Type: 

Field study in the wild

Location: 

South Africa

Target catch: 

Tuna

Effect on bycatch species: 

1.07 birds/1000 hooks (unweighted) vs. 0.06 birds/1000 hooks (weighted)

Effect on target catch: 

No detectable affect

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Study Type: 

Field study in the wild

Location: 

South Africa

Target catch: 

Tuna

Effect on bycatch species: 

Hybrid lines appeared to reduce sea bird attacks, but not statistically conclusive

Effect on target catch: 

None reported

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Study Type: 

Field study in the wild

Location: 

Western North Pacific

Target catch: 

Tunas and swordfish

Effect on bycatch species: 

Number of albatross and shearwater attacks were reduced with paired tori lines. Secondary attacks were also significantly lower with paired tori lines.

Effect on target catch: 

None reported

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Species: 

Procellaria aequinoctialis

The white-chinned petrel is the most common avian bycatch species in the Southern Ocean (Weimerskirch et al 1999; Gilman 2006; Robertson et al 2006; Birdlife International 2013). The high bycatch rate is due to seabirds, such as petrels, being attracted to pelagic and demersal longlines by bait and offal discarded from vessels (Gilman 2006; Bugoni et al 2008) and the high incident of spatial and temporal overlap between petrel foraging grounds and areas of fishery activity (Delord et al 2010b).

Distribution: 

Southern Ocean between the tropics and Antarctica

Population: 

~ 3 million
JJ Harrison

IUCN Status: 

Vulnerable

Type: 

Bird

Bycatch Threat: 

Longlines, trawls, gillnets

Study Type: 

Field study in the wild

Location: 

Falklands

Target catch: 

Patagonian toothfish

Effect on bycatch species: 

No bycatch

Effect on target catch: 

Catch was reduced

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Study Type: 

Field study in the wild

Location: 

Southwest Atlantic

Target catch: 

Tuna

Effect on bycatch species: 

American style longlines - no significant difference in catch rates for blue or porbeagle sharks, seabirds or sea turtles. Spanish style longline - significant decrease in pelagic stingray catch rates on circle hooks, no significant differences in catch

Effect on target catch: 

Albacore catches increased with circle hooks on both types of longline. Shortfin mako shark catch rates increased with circle hooks on the American style longlines.

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