Identification and Phylogenetic Study of Pathogenic BacteriaCausing Ulcerative Fin of Cultured Turbot Scophthalmus maximus

Three strains of pathogenic bacteria causing ulcerative fin of turbot were isolated from three fish farms of Shadong Peninsula, and they are all Gram-negative, rod-shaped and motile with polar flagella and translucent colony. It is shown from the conventional physiological and biochemical test and the 16S ribosomal RNA sequencing contrast results that they are the same species of bacterium, and their characteristics are very similar to those of Vibrio anguillarum. Their 16S ribosomal RNA gene sequences were analyzed, their phylogenetic dendrograms were constructed, and it is shown from the anlysis results that these bacterial strains have a close phylogenetic relation to Vibrio anguillarum, so the pathogenic bacteria are (identified) as Vibrio anguillarum.