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ISSCFG code: 04.3 – standard abbreviation: DRM
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OverviewHydraulic jet dredges are used to dig and to wash out mussels that have buried themselves in the seabed. Some dredges are so improved that the prey is not only dug out, or stirred up and collected in a bag, but is also conveyed on board the vessel by the same gear. Therefore this gear, combining and hauling, can be considered a harvesting machine. This is especially true in cases where mechanical shellfish diggers are combined with suction pumps, escalators or conveyors.Handling EquipmentFor lowering and lifting of the dredge, derricks and winches are used.Vessel Overview Dredgers.Fish OperationThis method is used for harvesting shellfish from the sea bed. The towed dredge scrapes up the complete shells from the bottom and stores them in its bag until they are brought aboard.Target SpeciesMussels.Water Area OverviewInshore and offshore sea waters all around the world. For inshore, shallow waters, dredging may be carried out by small boats towing a single dredge. Important offshore fisheries exist also, such as those for scallops on the east coast of North America and Alaska. These fisheries utilize larger vessels towing two or three dredges.Gear EnvironmentSandy muddy bottom.
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