Abstract
The study results of zoobenthos of the lower part of the Vychegda River and its tributaries are presented. Bentofauna includes 21 taxons of invertebrates ranging from 4 to 14 between the water-bodies. The number of invertebrates in the rivers varies from 300 to 17 850 inds./m2 being 5310±1403 inds./m2 on the average. Invertebrate biomass ranges from 0.1 g/m2 in sandy grounds to 28.8 g/m2 in sandy-silty grounds averaging 5.8±2.6 g/m2. By the index of E.V. Balushkina, the Vychegda River along 222 km from the mouth is a polluted river. For the other water-bodies, the E.V. Balushkina index ranges from 2.9 to 6.5 which allows them to be classified as moderately polluted water-bodies.
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