Viral hemorrhagic septicemia comparative susceptibility of rainbow trout salmo gairdneri and hybrids salmo gairdneri x oncorhynchus kisutch to experimental infection
Ord, W.M.; Le-Berre, M.; De-Kinkelin, P.
Journal of the Fisheries Research Board of Canada 33(5): 1205-1208
Rainbow trout (S. gairdneri) fry and yearlings were compared with hybrids of rainbow trout and coho salmon (O. kisutch) for susceptibility to viral hemorrhagic septicemia (VHS). In 3 trials, exposure to waterborne infectivity consistently resulted in a 77% mortality of rainbow trout fry; loss among the hybrid fry averaged only 11%. Tests showed survivors might be carriers of virus. Hybrid yearlings infected by gill brushing were fully refractory to VHS; mortality (3:8) and viremia were recorded among gill-infected rainbow trout yearlings.