Abstract

A clinical case of PKD occurred in rainbow trout held in an indoor recirculating unit together with goldfish and carp. The goldfish harboured spores of a myxozoan parasite belonging to the genus Sphaerospora suggesting that at least this non-salmonid fish species could be at the origin of the infection. While cohabitation experiments with the goldfish failed to transmit the disease to trout, the infection of PKX-free young rainbow trout was obtained by exposing them to sediments from the decantation tank of the recirculating unit.