This disease is caused by Rhabdovirus carpio . Most often, outbreaks occur in the spring after ponds are stocked. Young, farmed fish are very susceptible.
Any stress puts the fish at greater risk for developing infection.
The virus is spread in the feces, as well as possibly urine and gill mucus. The carp louse and a leech can also transmit the infection. Control Farmed fish and wild fish should not be mixed, and well or spring water should be used to supply ponds. In general, good management practices are key to keeping disease out. Literature Cited 1.