Abstract
The data on zoobenthos abundance, biomass, and species composition in the Merkys River in 1998, between April-October, is presented in this article. It has been established that macrozoobenthos abundance and the number of species are closely related to the type of the river ground. Thus, the highest zoobenthos abundance was determined in October on the gravel-type ground, and the highest biomass was established in April on the silt-sand ground. The prevailing zoobenthos species varied according to months and the ground types. The highest zoobenthos species diversity index was established on the stone-type ground, while the lowest, on the sand ground.
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