PURPOSE:To obviate the needs for diving operation by divers for removing shellfish by a method in which shellfish deposited in a shellfish deposition pond connected to an intake path is sucked up by a remote-controlled underwater robot and sent by submersible pumps into a netted collecting cage set in the pond in a vertically movable manner. CONSTITUTION:An underwater robot 1 having a shellfish suction port 2 and a suction hose 3 is set on a shellfish deposition pond 18 connected to the intake path of atomic power plants and so forth in a traveling manner on the bottom. A netted collecting cage 7A is hung down in the pond 18 in a vertically movable manner and a submersible pump 4 is also set. Shellfish and dead shellfish which deposit on the bottom of the pond 18 are sucked up by the water robot 1 and sent with water to the cage 7A by the pump 4, where the shellfish only is separated from water and taken out. Shellfish can thus be safely removed without requiring the divers.
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