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Bottom trawlA trawl designed to work at the sea bottom. The lower edge of the net opening drags along the seabed, and is normally protected by a thick ground rope and ballasted with chains, sinkers, rubber discs, bobbins, etc. Bottom trawls include low-opening trawls for demersal species such as beam trawls and shrimp trawls, and high-opening demersal otter tr [..]
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