Bacterial shell disease of crustaceans

First described by Hess (1937). Occurs in all environments at all temperatures, where commercial crustaceans are reared; economically significant in southern European areas of the USSR. Highly contagious; rate of infection for Homarus americanus and Pontogammarus robustoides recorded as 0% to 72% in four months and 72% to 90% in  five days, respectively.