The study was aimed at comparing effects of rearing whitefish larvae on three types of diets, i.e., a trout starter, frozen zooplankton, and a mixed diet (starter + frozen zooplankton). After 21 days in culture, fish survival rate and growth were similar in the three treatments (P>0.05). All the three diets can be successfully applied in rearing whitefish larvae. When an artificial feed is used, it is advantageous to supply the diet with natural food for the first two weeks of culture. The mixed diet consisting of the artificial feed and frozen zooplankton resulted in a four-fold reduction of the risk of abnormal swimming behaviour (swimming on the side) observed on a mass scale in the larvae fed exclusively the artificial feed.

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