properties Antimicrobial peptides(AMPs) from marine organism hydroly sates are increasingly isolated and reported during the last few years. Liu et al. 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