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This study examined the behavioral characteristics of juvenile Japanese surf clams Pseudocardium sachalinensis in relation to bottom disturbance under laboratory conditions, and estimated the fluid conditions necessary to wash the clams out of the sand. The juveniles burrowed in sand when their buried depth decreased to •ƒ1.5 times the shell length due to erosion, and more upward when the depth increased to •„2.5 times the length by deposition of sand. Burrowing and climbing speeds tended to be about 1.8 times faster than the speed of erosion or deposition of sand. The juveniles were washed out of the sand when the erosion speed rose above

Studies on the Behavioral characteristics and the Mortality of the Japanese surf clam, Pseudocardium sachalinensis, in Relation to Wave action