1. Faculty of Fisheries and Protection of Waters; South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses; Institute of Aquaculture and Protection of Waters; University of South Bohemia in Ceske Budejovice; České Budějovice Czech Republic
2. Department of Lake and River Fisheries; Faculty of Environmental Sciences; University of Warmia and Mazury in Olsztyn; Olsztyn Kortowo Poland