INVESTIGATION OF THE CAUSE OF MASS MORTAL ITY AMONG MARINE CULTURED RAINBOW-TROUT (ONCORHYNCHUS-MYKISS, WALBAUM) AT A FISH FARM IN THE SOUTH-WEST NETHERLANDS

The present study investigated the mass, mortality of marine cultured young rainbow trout (Oncorhynchus mykiss, Walbaum) in the Netherlands. The course of the disease, the clinical symptoms, and bacteriological and virological investigations lead to the diagnosis: 'primary infect ious pancreatic necrosis virus (IPNV) infection followed by secondary vibriosis. Treatment with flumequine seemed to be effective. The trout were possible infected with IPNV the trout hatchery and nursery from which they originated.