A total of 219 marine bacterial strains isolated from healthy shrimp and aquatic environment were tested for their inhibitory activities by using cross-streaking method,dot -inoculating method and scrip diffusion assay on 2216E plates. Six strains were selected by their inhibitory activities to four pathogenic indicating vibrios. Vibrio anguillarum,Vibrio parahaemolyticui,Vibrio campbelli and Vibrio natriegen were tested.Inhibitory activities of bacterial strain J-10 and it's extracellular products (ECP) ag...