Affiliation: | 1. Department of Lake and River Fisheries, Inland Fisheries Institute, , Oczapowskiego 10, 10–719 Olsztyn‐Kortowo, Poland;2. Department of Aquaculture, Inland Fisheries Institute, , Oczapowskiego 10, 10–719 Olsztyn‐Kortowo, Poland;3. Department of Ichthyology, Warmia and Mazury University in Olsztyn, , Oczapowskiego 5, 10–718 Olsztyn‐Kortowo, Poland |