Clinical signs of infection with SVCv are often non-specific.
Affected fish may appear lethargic, exhibit decreased
respiration rate and loss of equilibrium. Moribund fish have
been reported to 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 (Fijan 1999