The length of bar and number of dredges is dictated by the power of the vessel and its length of side deck to work the dredges over. Several of these dredges are towed behind a heavy spreading bar, usually one from each side of the vessel. This bag is made of chain links forming a chain mesh on the bottom and usually netting on the top. The dredges consist of a triangular frame, about 750mm wide, with a toothed bar at the front to flip the scallops out of the seabed and into a collecting bag behind it. Each dredge is designed specifically for the fishery and target species. In the UK the main dredge fishery is for king scallops and to a lesser extent queen scallop, mussels, oyster, and razor clams.
Dredges are rigid structures that are towed along the seabed to target various species of shellfish.
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