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abundance Acad acre Amer anglers animals average Baltimore Balto Biol boat bottom Bull bushels Calvert Cecil County Chesapeake Bay commercial catch County crabs Deep Creek Lake Department of Research Dept District of Columbia effects of hydraulic eggs estimates Figure Fresh-water G. P. Putnam's Sons Geol harvest hatching Hist hunting hydraulic clam dredging inches increase indicate insects Journ kill marshes MARYLAND AND VICINITY Maryland Department Maryland tidewater Natural History North America oyster oyster setting Patuxent River percent plants population Proc production Queen Anne's Counties region Research and Education samples season Severn River shell clam industry smallmouth soft shell clam spawning species sport fishermen sport fishing stocking striped bass survey swimbladder swlmbladder Table tagging tion Trans tributaries trout U. S. Bur U. S. Fish U. S. Nat Virginia Wash Washington waterfowl Worcester County yellow perch