It is one of the oldest known fish diseases and is caused by Herpesvirus cyprini . Common carp, crucian carp, barbel, bream, golden ide, pike-perch, rudd, smelt, tench, carp x goldfish hybrid, and various aquarium fish are susceptible to this virus.
Skin lesions appear as the water temperature drops in winter.
Leeches, parasites, and bugs could potentially transmit the virus. Cohabitation and contamination of abraded skin are the primary routes of infection. Control Treatment is non-existent, though management practices can be modified to prevent the spread. Avoidance of inbreeding, crowding, and low water temperature should be considered. Literature Cited 1.