Three different viruses observed from the tissues of diseased mandarin fishSiniperca chuatsi

Three different kinds of viruses, the spherical virus SCSV with a diameter of about 280 rm, the rhabdovirus SCRV with a size about 250 × 120 nm, and the baculovirus SCBV with a size about 200 × 100 nm, were observed from the tissues of diseased mandarin fishSiniperca chuatsi with outbreak of infection and acute lethality. This phenomenon implicated that the reason why the epizootic disease of mandarin fish could not be quenched by only one kind of virus vaccine can be explained by the fact that the fish may be infected by different kinds of viruses. Therefore, more attention should be paid to the complexity of virus pathogens in the prevention strategy for mandarin fish diseases.