A gillnet is a wall or curtain of netting that hangs in the water. The term covers several forms including stationary gillnets and trammel nets.
While particular species of fish can be targeted by area, gillnets do carry the risk of bycatch (accidental capture of unwanted species) and interaction with other marine animals.
In order to be MSC certified, gillnet fisheries are often required to make improvements, which include increased monitoring and independent observer coverage. Gear modifications have also been made and some fisheries use ‘pingers’: acoustic alarms attached to nets which deter marine mammals.
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Longline fisheries trail long lines with baited hooks attached to attract target fish. They often require measures to reduce contact with other species.