Furunculosis and Other Diseases Caused by Aeromonas Salmonicida.

Furunculosis is a generalized internal infection prevalent in trout and salmon. The disease was first described in Germany in 1894 and was named for the large raised lesion called a furuncle Fig. 1 seen in the chronic disease. The bacterium causing the disease is Aeromonas salmonicida. For many years it was believed that A. salmonicida infected only salmon and trout, but variants of the bacterium have now been found to cause goldfish ulcer disease, carp erythrodermatitis, and infections in some marine fishes.