STREPTOCOCCOSIS IN AQUARIUM FISH

Streptococcus-like bacteria were recovered in large numbers from morib und zebra danios Brachydanio rerio and pearl danios Brachydanio alboli neatus imported into Canada as aquarium species. Histopathology reveal ed a bacteremia with lesions present in many organs, but in particular the spleen and kidney. These could best be characterized as acute and necrotizing rather than granulomatous. Similar disease was subsequent ly produced experimentally in zebra danios as well as in rainbow trout Oncorhynchus mykiss and white cloud mountain minnows Tanichthys albon ubes, by means of bath immersion. In these experiments, mortality star ted 2 to 4 d after exposure.