"The principal objectives of this study were: (1) to locate suitable intertidal and subtidal clam planting sites and to determine the feasibility of planting laboratory spawned clams, (2) to map locations of bay clams having commercial harvesting potential, (3) to develop techniques for spawning and rearing native species of clams and determine If fast growth is a heritable characteristic of the Manila littleneck clam Venerupis philippinarium and, (4) to determine the feasibility of purchasing and planting juvenile red abalone Haliotis rufescens along the Oregon coast." (Introduction) Includes maps of substrate and clam beds of Alsea, Coos and Tillamook bays.