Authors
Tomasz Kakareko
Institute of Environmental Protection Department of Hydrobiology, Nicholas Copenicus University, Toruń, Poland
Paweł Napiórkowski
Institute of Environmental Protection Department of Hydrobiology, Nicholas Copenicus University, Toruń, Poland
Jacek Kozłowski
Chair of Fish Biology and Pisciculture, University of Warmia and Mazury, Olsztyn, Poland