Seabirds

Field Study 814

Study Type: 

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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Field Study 813

Study Type: 

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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Field Study 785

Study Type: 

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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White-chinned petrel

Species: 

Procellaria aequinoctialis
JJ Harrison
Photo: JJ Harrison

Type: 

Bird

Distribution: 

Southern Ocean between the tropics and Antarctica

Population: 

~ 3 million

Bycatch Threat: 

Longlines, trawls, gillnets

IUCN Status: 

Vulnerable

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).

Field Study 748

Study Type: 

wild

Location: 

Queensland, Australia

Target catch: 

Tunas, swordfish and mahi mahi

Effect on bycatch species: 

Assumed to benefit

Effect on target catch: 

No significant effect

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Field Study

Study Type: 

wild

Location: 

Falklands

Target catch: 

Patagonian toothfish

Effect on bycatch species: 

No bycatch

Effect on target catch: 

Catch was reduced

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Field Study

Study Type: 

wild

Location: 

Chilean Patagonia

Target catch: 

Patagonian toothfish

Effect on bycatch species: 

Reduced bycatch to zero

Effect on target catch: 

CPUE was higher

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Field Study 705

Study Type: 

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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