Susceptibility of Triploid Rainbow Trout to IHN, Furunculosis and Vibriosis

Abstract

Triploid rainbow trout was compared with diploid one for the susceptibility to IHN, furunculosis and vibriosis, and for the effectiveness of vibrio vaccination. No difference was observed between the triploids and the diploids in the mortality or in the mean days to death when challenged with the pathogens of the diseases. Vaccinated triploids showed significantly lower mortality than triploids without vaccination when challenged with Vibrio ordalii, and there was no difference in the mortality between vaccinated diploids and triploids. These results suggest that susceptibility to those infections and effectiveness of vibrio vaccination are principally the same for both diploid and triploid rainbow trout. © 1995, The Japanese Society of Fish Pathology. All rights reserved.