The protective effects of autogenous and commercial ERM immersion vaccines (bacterins based on Yersinia ruckeri, serotype O1, biotypes 1 and 2) for rainbow trout ( Oncorhynchus mykiss ) were compared in order to evaluate whether the use of local pathogen strains for immunization can improve protection. In addition, the effect of the bacterin concentration was established for the commercial product. Following sublethal challeng...

Gill parasitic infections challenge farming of rainbow trout ( Oncorhynchus mykiss, Walbaum) in freshwater facilities. Apart from flagellates ( Ichthyobodo, (Pinto) and ciliates ( Ichthyophthirius (Fouquet) , Ambiphrya (Raabe), Apiosoma (Blanchard), Trichodinella (Sramek‐Husek) and Trichodina (Ehrenberg)), we have shown that amoebae are prevalent in Danish trout farms. Gills were isolated from farmed rainbow trout in six fish...