Bottom view of a hydraulic jet dredge developed to harvest surf clams and ocean
quahogs 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-pressure
jets of water. A v-shaped knife scoops up the clams; other jets are positioned
to push the clams into the "cage" of the dredge for bringing to surface.