For consideration of the contamination of rainbow trout propagation and breeding centers in Iran to SVC (Spring Viremia of Carp), we prepared tissue samples from gills and parenchyma`s organs. Samples of paranchymatous organs and gills were taken and prepared for Molecular and pathological testing by standard methods. Internal wall of air bladder, kidney, liver, intestinal curves and skeletal muscles of rainbow trout with the symptoms of disease in these centers and considered the prepared samples by both molecular and pathological techniques. Thirty six samples had the typical pathological clinical signs and 14 samples were diagnosed positively by PCR method and 1 sample had doubtful result. The results of this study revealed the frequency of SVC virus in some centers of rainbow trout propagation and breeding in Iran and therefore, the control and diagnosis of disease is necessary. This is the first study of the SVC infection in rainbow trout in propagation and breeding centers in Iran and can be useful for this virus isolation and consideration of the severity of its disorders.
