Abstract
Numbers and species composition of filter-feeding Cladocera and Calanoida occurring in the near-bottom water layer in different seasons of the year and at different depths were compared with their occurrence in the pelagial. Specific species for the near-bottom water layer were not recorded, but numbers of crustaceans were frequently higher in this layer than numbers noted in the pelagial. The food availability may be one of the reasons for the abundance of filter-feeders close to the bottom. Two species:Bosmina longirostris andEudiaptomus graciloides formed aggregations in particular parts of the lake at various seasons: in autumn the highest densities of these species were in the near-bottom layer and closer to the shore, in winter — in close to the bottom in the deepest part of the lake, in spring and summer
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