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The littoral zone of Lake Balaton and its periphyton-zooplankton-fish communities have been investigated intensively in recent years . Total average number of crustacean plankton varied from 36 to 126 ind 1 -1 , their biomass from 0 .49 to 1 .86 mg ww 1 -1 month -1 at different areas of the littoral zone . In general, these values for the above parameters were higher in hypertrophic areas . 23 fish species occurred in the littoral zone with cyprinids dominating . The seasonal food spectra of Y-O-Y roach (Rutilus rutilus), white bream (Blicca bjoerkna) and bream (Abramis brama) were based mainly on planktonic crustaceans and benthic/periphytic invertebrates . According to the frequency of occurrence of crustaceans and other invertebrates, the food composition of young cyprinids differed significantly in the NE and SW-basins of the lake .

Risk assessment of non-native fishes in the catchment of the largest Central-European shallow lake (Lake Balaton, Hungary).