Spring Viremia of Carp (SVC)
Spring Viremia of Carp (SVC) is a viral disease that can cause death in several carp species.
Historically the disease has been a problem in Europe, the Middle East, and Russia, but was reported in koi and feral carp in the United States for the first time in 2002. The most recent SVC finding was in 2011 in feral carp in Minnesota waters. SVC is not believed to be widespread in the U.S. but rather is limited to certain areas where the wild fish population is susceptible to the disease.
SVC is transmitted through feces, as well as through leeches and crustaceans. Affected fish may appear lethargic, breath slowly, and show a loss of equilibrium. Sometimes fish will lie on their sides, often on the bottom of the tank, and when startled swim up but then return to the bottom. Fish are also reported to congregate where there is slow water flow and near pond banks.