Kolozin V. A. RussiaSaratovBerg State Researh Institute on Lake and River Fisheries, Saratov branch, 152 Chernyshevskogo Str., Saratov 410002, Russiae.filinowa@yandex.ru Author's articles REGULARITIES OF THE RATIO OF THE SHELL LENGTH TO THE INDIVIDUAL WEIGHT OF MOLLUSKS FROM THE DREISSENA GENUS (DREISSENIDAE, BIVALVIA) IN THE VOLGOGRAD RESERVOIR