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Trawling is common worldwide due to its efficiency in capturing large numbers of fish.
Demersal or bottom trawling covers several gear types, all of which use a cone-like net with a closed end (cod-end) that holds the catch. These nets are towed by one or two boats and are designed to catch fish living at great depths or on the bottom of the sea.
Pots and traps are used in commercial fishing to catch crustaceans like lobsters and crabs. Exclusion devices are used to prevent other species being caught.
Dredges are rigid structures that are towed along the seabed by a boat to harvest bivalves such as scallops, oysters and clams.
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