1. Department of Fisheries, Apiculture, Wildlife Management and Special Zoology, University of Zagreb Faculty of Agriculture, Zagreb, Croatia; e-mail: , agavrilovic@agr.hr, ispelic@agr.hr, tradocaj@agr.hr
2. Faculty of Agrobiotechnical Sciences, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia; e-mail: , sinisa.ozimec@fazos.hr, andjelko.opacak@fazos.hr
3. Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, Gödöllő, Hungary; e-mail: , Kovacs.Balazs@uni-mate.hu, Balogh.Reka.Eniko@uni-mate.hu
4. Department of Ecology and Vertebrate Zoology, Faculty of Biology and Environmental Protection, University of Łódź, Łódź, Poland; e-mail: