) properties Antimicrobial peptides(AMPs) from marine organism hydroly sates are increasingly isolated and reported during the last few years. Liu et al. [8] first identified an AMP(named CgPep33) in oyster muscle proteolysed using a combination of alcalase and bromelin. The cgPep33 is ine-rich peptide composed by seven residues[c, L E, D, F, Y I and Gl, and inhibits growth of several