What is a large bag net attached to a beam with iron frames at its ends, and dragged at the bottom of the sea, -- used in fishing, and in gathering forms of marine life from the sea bottom called?

trawl — A large bag net attached to a beam with iron frames at its ends, and dragged at the bottom of the sea, -- used in fishing, and in gathering forms of marine life from the sea bottom. (Webster's 1913.)

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