Abstract
Two viruses have been isolated from tench (Tinca tinca) and from chub (Leuciscus cephalus). The agents replicated in EPC- and FHM cells at 20.degree.C forming syncytia and lysis. Electron micrographs of the virion revealed icosahedral particles with a double capsid and a size of 70-75 nm. The genome of the isolated viruses consisted of 11 segments of dsRNA, SDS-PAGE migration patterns of the RNA revealed differences between the isolates and between the reoviruses of fishes. The isolates are serologically identical and they show serological relationships to the golden shiner virus (GSV) and to a lower extent to the chum salmon virus (CSV).