Growth and Survival of the American Oyster Crassostrea virginica in Jamaica Bay New York

摘要

Jamaica Bay is a major inlet opening to the Atlantic Ocean. It was abundant with oysters until early 1900's. Over-harvesting, pressure from predators, parasitic invasion and declining water quality often are cited as causes. Despite actions to arrest and reverse the pollution, oysters are not reestablished. We are studying factors relating to the rehabitation of Crassostrea virginica in Jamaica Bay to determine if the water quality and environmental conditions are suitable for their survival. Oysters placed in Jamaica Bay grew well when housed in protective containers and growth was influenced by placement near the sediment as compared to the surface. Oysters placed 1 foot above the sediment grew larger that those suspended 1 foot below the surface. Water temperature, pH, turbidity, salinity, conductivity, chlorophyll-a and dissolved O2 were taken to compare water quality at each site. To study growth and survival in a more natural condition, oyster seed and adults were placed just off the bottom in unprotected containers and photographed. After 1 year they are growing and surviving well and there has been evidence of reproduction. Thus far there are no serious signs of predation by crabs or starfish. The study shows that Jamaica Bay water quality is suitable for oyster growth under the various conditions of our experiments.