Infection of grayling (Thymallus thymallus) with the agent of bacterial kidney disease (BKD).
15 of 20 grayling died within 8 months of injection with 3 × 107Renibacterium salmoninarum. All infected fish were anaemic, had a pale empty gut with haemorrhages, and had large swollen kidneys. None of 20 fish in contact with the experimentally infected grayling developed clinical signs, although the bacterium was isolated from the kidneys of 5 of them. R. salmoninarum was also isolated from 2 of 5 wild grayling from a river in which wild trout and trout in a connecting fish farm had had bacterial kidney disease.