A Bacillus strain(H-1) was isolated from the intestinal tract of healthy Paralichthys olivaceus.Antagonistic activity of H-1 was tested against Vibrio anguillarum(W-1).The results showed that H-1 was found to have strong antagonistic activity against W-1(inhibitory zone diameters=33.05 mm).Through study on its morphological,physiological and biochemical characteristics as well as 16S rDNA sequence homology comparison,the strain H-1 was identified as Bacillus subtilis,which was almost the closest relative to...