1. Department of Ichthyology and Aquaculture, Faculty of Animal Bioengineering , University of Warmia and Mazury in Olsztyn , Poland
2. Department of Aquaculture , National Inland Fisheries Research Institute , Olsztyn, Poland Oczapowskiego 10, 10-719, Olsztyn , Poland
3. Department of Salmonid Research , National Inland Fisheries Research Institute , Olsztyn , Poland
4. Chair of Hydrobiology, Ichthyology and Biotechnology of Reproduction. Faculty of Food Sciences and Fisheries , West Pomeranian University of Technology in Szczecin , Poland