Abstract: It is a fact that Bdellovibrio can lyse gram-negative pathogenic bacteria. In this study, 4 strains of Bdellovibrio sp., designated Bh04-4, Bh04-41a, Bh04-A+ and Bh04-1f, were respectively isolated from seawaters using Bh04 as a host bacterium. 41 strains of vibrios from either aquatic waters or seafood were used as hosts. After confirmation of being Bdellovibrio sp. by electron microscopy and specific PCR method, lytic ability on 41 vibrios was assayed. Results showed that taking all four Bdellovibrios together, 36 lysed out of 41 strains, amounting to 87.8% lysis ability. The lysis abilities on Vibrio parahaemolyticus, Vibrio cholerae and Vibrio alginolyticus were 88.9%, 83.3%, 81.8% respectively. Results of this study fully demonstrated the potential application of Bdellovibrio on lysing vibrios from seafood origin.

Key words: Bdellovibrio, vibrio, lysis ability, seafood, biological control method