Identification and pathogenicity of Aeromonas veronii isolated from sexually mature female Hypophthalmichthys molitrix

An outbreak of bacterial septicemia in female silver carp Hypophthalmichthys molitrix , which caused significant death the fish Yantian Reservoir, was investigated. The pathogen isolated from diseased and identified as Aeromonas veronii utilizing biochemical characteristics molecular methods analyses. artificial infection experiment indicated that strain 100% mortality juvenile mature with eggs but no male fish. Silver challenged A. showed similar clinical signs naturally infected histopathological study revealed increment hemosiderin granules vacuole formation tissues spleen livers, well collapse, deformation, disintegration egg cells. ACP, AKP, CAT enzyme activities serum both artificially were decreased significantly severe infection. In this study, primary causing mass sexually Reservoir.