1. Department of Zoology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
2. Department of Ichthyology, Faculty of Environmental Sciences, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
3. Department of Marine Biology and Ecology, Institute of Oceanography, University of Gdansk, Gdynia, Poland
4. Department of Lake and River Fisheries, Faculty of Environmental Sciences, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland