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abundance acres adductor muscle animal Aquiculture attached auricle barren bottoms biologists bivalve boats body brood stock bushels of oysters cavity Chesapeake Bay Chesapeake Biological Laboratory Chesapeake oyster chick grit cilia Conservation Department cultch depleted and barren digestive dredge dredgers embryo fact favorable food and oxygen gallons gastrula germ cells gills greater numbers highly hinge ligament inches in length Industry of Maryland known larval oysters leasing Lime deposit mantle Maryland's oyster mechanical advantage method millions of bushels molluscs natural bars natural beds operate organs oyster culture oyster dealers Oyster farming oyster industry oyster larvae oyster production oyster resources oyster tongs oystermen oysters are placed particles patent tongs Pericardial cavity period posterior producing oysters purposes restoration seed areas shell pile shell planting shuckers Sinepuxent Bay spat spawn steam stomach supply surface Tangier Sound teeth temperature tide toothed bar University of Maryland valves veliger velum water ranges young oysters