The aim of this study was to determine the pathogenic bacterium infecting Siniperca chuatsi. Bacteria were isolated from the liver of diseased S. chuatsi and identified by the Vitek 2 Compact Identification System and 16 S rRNA sequence analysis. Healthy S. chuatsi was used for experimental infection with bacterial suspension. A bacterial strain B01 was isolated from diseased S. chuatsi. Identification demonstrated that the bacterium was Pseudomonas fluorescens( Table 1,Fig. 2),and its growth characteristic...