"August 1981." The University of Maryland Sea Grant Program sponsors and annual oyster spat survey cruise to determine recruitment trends for Chesapeake Bay oyster populations ... Personnel from Maryland's Office of Environmental Programs began participating in the cruise in 1979 to collect adult oysters for heavy metal, PCB, and pesticide analysis. This effort was initiated to create a continuous record of heavy metal, PCB, and pesticide levels in oyster tissue on a broad Bay wide [sic] scale."--Page 1. Includes bibliographical references (page 18). Supported by the National Oceanic and Atmospheric Administration, Office of Coastal Zone Management, through the Maryland Dept. of Natural Resources, Tidewater Administration, Coastal Resources Division.