1. University of South Bohemia in Ceske Budejovice, Faculty of Fisheries and Protection of Waters, CENAKVA, Institute of Aquaculture and Protection of Waters, Na Sádkách 1780, 370 05 České Budějovice, Czech Republic
2. Department of Biology, University of Ss. Cyril and Methodius, J. Herdu 2, 917 01 Trnava, Slovak Republic
3. Faculty of Science, University of South Bohemia, Branišovská 1760, 370 05 České Budějovice, Czech Republic