ABSTRACT
Email: dobsikovar@vfu.cz 2 Research Institute of Fish Culture and Hydrobiology Vodnany, Faculty of Fisheries and Protection of
Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, University of South Bohemia Ceske Budejovice, Zatisi 725/II, 389 25 Vodnany, Czech Republic.
