Authors
Natalia Kurhaluk
Institute of Biology, Pomeranian University in Słupsk, Słupsk, Poland
Joanna Grudniewska
Department of Salmonid Research, Stanisław Sakowicz Institute of Inland Fisheries, Rutki, Żukowo, Poland
Halina Tkaczenko
Institute of Biology, Pomeranian University in Słupsk, Słupsk, Poland