Resistance of the Pacific lamprey, Lampetra tridentata (Gairdner), to challenge by Renibacterium salmoninarum, the causative agent of kidney disease in salmonids.
Groups of 4 lampreys captured during upstream migration were inoculated i/p with R. salmoninarum at 1.3 × 102, 1.3 × 104 or 1.3 × 106 colony forming units. They remained healthy until killed 92 days later. The bacterium was not detected in their kidneys by Gram staining, immunofluorescence or culture. The results suggest that the lamprey is not a carrier of bacterial kidney disease.