Seabirds

Field Study 654

Study Type: 

wild

Location: 

South Africa

Target catch: 

Tuna

Effect on bycatch species: 

Weighted branch lines with hybrid streamer lines reduced seabird mortalities by 86% compared to unweighted branch lines.

Effect on target catch: 

No effect

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Field Study 652

Study Type: 

wild

Location: 

Southern Ocean

Target catch: 

Southern bluefin tuna

Effect on bycatch species: 

The use of both tori-lines and blue-dyed bait (squid and fish) resulted in no interactions with seabirds

Effect on target catch: 

None reported

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Field Study 651

Study Type: 

wild

Location: 

Southern Ocean

Target catch: 

Southern bluefin tuna

Effect on bycatch species: 

Decreased bycatch

Effect on target catch: 

The CPUE of the target southern bluefin tuna was reduced, except when blue-dyed fish bait was used.

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Field Study 646

Study Type: 

wild

Location: 

South Pacific

Target catch: 

Southern bluefin tuna

Effect on bycatch species: 

No difference in seabird avoidance between the two types ("WCPFC type and "Light type") of tori-lines

Effect on target catch: 

None reported

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Field Study

Study Type: 

wild

Location: 

Western North Pacific

Target catch: 

None reported

Effect on bycatch species: 

Tori-line light streamer reduced bait-taking behavior and bycatch of seabirds compared to the tori line

Effect on target catch: 

None reported

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Field Study 629

Study Type: 

wild

Location: 

North Pacific Ocean

Target catch: 

None reported

Effect on bycatch species: 

In experiement 1, the mean number of seabirds appearing and the catch per unit effort (for seabirds) was not statistically different between the four tori-lines. In experiment 2, seabird attack rates (Laysan albatross and shearwater) were not statistic

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Field Study 613

Study Type: 

wild

Location: 

Eastern Australia

Target catch: 

Tuna

Effect on bycatch species: 

Live bait sank more quickly than dead bait, increasing the exposure of hooks to seabirds but the sink rates of individual live bait species were very variable. With respect to dead bait, those on the 160 g leaded swivel with a distance of 2 m leader len

Effect on target catch: 

None reported

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