Trawls

Trawls are cone-shaped nets with two, four, or more panels, ending in a bag. They are towed at midwater or near the bottom, and held open horizontally by heavy doors (<i>otter trawls</i>), by beams, or by the tension created by lines connecting the net to two separate vessels (<i>pair trawls</i>). The net opening is sustained vertically by floats and weights. Fish size and species is controlled by mesh size; pelagic, demersal, and benthic fish can be targeted. The recent development of trawls with large wheels (<i>rockhoppers</i>) prevents damage and tangling of nets, and has eliminated the disincentive to trawling along rugged seafloors.
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For more detailed information, please visit the FAO Fisheries and Aquaculture Department <a href="http://www.fao.org/fishery/geartype/103/en" target="_blank">trawl nets</a> web page.

Study Type: 

wild

Location: 

off Washington, Oregon, and Northern California

Target catch: 

Ocean shrimp

Effect on bycatch species: 

Reduction in levels by between 66% and 88% from historical levels

Effect on target catch: 

7.2% shrimp loss when using 19-mm rigid-grate bycatch reduction device

Article: 

Fishing Gear: 

Bycatch species: 

A review of dolphin and porpoise bycatch issues in the Southwest of England

Study Type: 

wild

Location: 

United Kingdom

Target catch: 

Bass

Effect on bycatch species: 

Did not reduce bycatch

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

Analysis and mitigation of cetacean bycatch in UK fisheries

Study Type: 

wild

Location: 

United Kingdom

Target catch: 

Bass

Effect on bycatch species: 

Did not reduce bycatch

Article: 

Bycatch species: 

Reduction technique: 

Fishing Gear: 

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