It can also damage the seabed if they use dredges carelessly. Scallops often contain sand when fishermen use dredges. It overturns rocks and can crush animals and plants in its path. The weight and strength of this can dig up the ground. There could be up to 20 on each side for a 30-metre ship with 1500 hp. There could be 3 on each side on a small 10 metre boat. ![]() The length of the bar and the number of dredges towed is dependent on the power of the ship and the room on the side of the boat for working the dredges. Usually there is one on each side of the ship. A number of these dredges can be towed from a heavy spreading bar. Sometimes three or four dredges are attached to a wheeled stiff axle. The net catches the larger organisms: in the case of scallop dredging that includes the scallops' predators, such as whelks, starfish and octopus. ![]() The New Bedford (USA) dredge does not have teeth.ĭredge nets have a gross mesh in order to let organisms smaller than the target organisms through. These teeth raked or ploughed the sand and mud. In Europe, dredges used to have "teeth" at the bottom, called tynes. Fishermen then lift the dredge into the boat and empty it. It is pulled along the bottom of the sea by a fishing boat to collect scallops, oysters and other kind of clams, crabs, and sea cucumber. ![]() From L'Encyclpédie of 1771Ī fishing dredge, also known as a scallop dredge or an oyster dredge, is a kind of fishing net. Oyster harvesting using rakes (top) and sail driven dredges (bottom).
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