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Bottom view of a hydraulic jet dredge developed to harvest surf clams and oceanquahogs previously unutilized. The dredge is towed on the seafloor at depths of 30 to 100 feet, and clams are washed out of sand and gravel by high-pressurejets of water. A v-shaped knife scoops up the clams; other jets are positionedto push the clams into the cage of the dredge for bringing to surface.