Epidemiological risk factors affecting the presentation of viral agents in freshwater aquaculture in north-eastern Spain.

Ortega, C., Planas, E., Docando, J., Múzquiz, J. L., Alonso, J. L. and Simón, M. C.
Bull. Eur. Ass. Fish Pathol.
A study of viral pathology in northeast Spain freshwater aquaculture showed that infectious pancreatic necrosis (IPN) and spring viraemia of carp (SVC) were present. We did not detect infectious haematopoietic necrosis (IHN) or viral haemorrhagic septicaemia (VHS). IPN virus was isolated from rainbow trout, carp, barb, nase and brown trout from rivers where some of these infected fish farms are located. SVC virus was only isolated from carps from marshes. IPN virus was isolated from fish of all ages, but only produced clinical disease in rainbow trout younger than 6 months old. SVC virus was isolated in carp older than one year. The spring has shown the higher risk of infection and clinical disease presentation.
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