Sinking/weighted lines/baits

Changing the property of fishing lines so that they are less likely to catch or ensnare animals feeding at the surface or in the mid-water column. They include low profile line, a kind of rope linking lobster pots that might be suspended deep enough to avoid whale entanglements but with enough floatation to lie above rocky bottoms that tend to abrade them. Weighted mainlines may also increase the sinking ate of pelagic longline gear, making it less likely to capture surface-feeding seabirds.

Review of sinking groundline performance in the Maine lobster fishery, with recommendations for improving its fishability.

Study Type: 

summary

Location: 

Northwest Atlantic

Target catch: 

Lobster

Effect on bycatch species: 

N/A

Effect on target catch: 

N/A

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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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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 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 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 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 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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