Language: Russian with English summary and scientific nomenclature
The results of a long-term study of mollusks in Pechora, Korotaikha, Mezen, Vychegda and Luza Rivers are generalized. The book reviews the peculiarities of the distribution of mollusks and their role in the aquatic communites under different native and anthropogenic conditions. Dominant species are ascertained and their importance in feeding of fishes is discudsed. The distribution of 90 mollusk species in the Russian European North-East is mapped. This monograph is intended for hydrobiologists, ichthyologists, zoologists, teachers of higher schools and students.