1. Department of Parasitology, BIOCEV, Faculty of Science, Charles University, 252 50 Vestec, Czech Republic
2. Institute of Parasitology, Biology Centre, Czech Academy of Sciences, 370 05 České Budějovice, Czech Republic
3. University of South Bohemia, Faculty of Fisheries and Protection of Water, CENAKVA, Institute of Aquaculture and Protection of Waters, 370 05 České Budějovice, Czech Republic
4. Faculty of Science, University of South Bohemia, České Budějovice, Czech Republic