The presence of gastropod and bivalve in seagrass ecosystem has an important role in the structure of the food chain. Gastropod and bivalve are the class of mollusca that are known to be well associated with seagrass ecosystems. The aims of study are not only to determine the type and density of seagrass, but also to determine the structure of bivalve and gastropod communitie in seagrass ecosys…