The aim of the experiment was to examine prey size selection of peled (Coregonus peled Gmel.) larvae using Strauss linear index for food selection. For this purpose larval peled were held in illuminated cages at two stocking densities (10 000 and 40 000 individuals per cage) in three water bodies of diverse trophic characteristics. In the first days of rearing peled larvae fed on zooplankton up to 0.5 mm in length. Then most peled larvae significantly more often selected organisms up to 1 mm, which were most abundant in the environment. Under good feeding conditions, reared fish selected medium-sized zooplankters (from 0.6-1.0 mm length class, less often those 1.0-1.5 mm in length). Stronger food pressure for small prey appeared at a time of poor feeding conditions. Fish fed rather randomly on larger planktonic organisms (>1.5 mm), which were not abundant in the environment. Statistically significant differences were observed in food selection between the cages with different stocking densities, even when the feeding preferences were similar. Large variability in the feeding behaviour of peled larvae was observed during the whole rearing period.
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