Objective: To screen the antibacterial fractions and constituents of Scapharca subcrenata Lischke.Methods: The soft tissues of S.subcrenata was extracted by ethanol.Liquid- liquid extraction with petroleum ether,ethyl acetate,n- butanol and water was used for the separation of ethanolic extract and 4 organic fractions were obtained.The antibacterial activities of the ethanolic extract and organic fractions was evaluated by diameter of inhibition zone( DIZ) and the minimum bactericidal concentration( MBC). T...