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The oyster industry of the United States is the greatest in •he world; it represent•s the largest development in the field of aquiculture. In the cultivation and harvesting of oysters, considerable capital is invested, and there is involved a large expenditure of funds in connection with the cultural operations. I[t is necessary that we learn as much as possible about the oyster and its environment in order that these operations may be carried on efficiently. Studies along •his line have been carried on by the Bureau of Fisheries at various stations on both the east and the west coast.