The food of Pseudorasbora parva juveniles from the Kis-Balaton Reservoir in Hungary was analyzed. Nine food components, among which filtrating Cladocera dominated, were confirmed in the diet of this fish. The highest values of the relative importance index were observed for Bosmina sp. at 53.7% (September 1991) and Daphnia sp. at 47.6 and 55.5% in July and September 1992, respectively. Due to the presence of this new ichthyofauna representative in Polish waters, it is possible that the pool of fish species which pressure filtrating Cladocera will increase. Additionally, this species may become a food competitor for native fish both in open waters and cultivation reservoirs.
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