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The first record of bivalve mollusc Corbicula fluminea (O. F. Müller, 1774) in the basin of the river Don occurred in the area of Warm channel of Novocherkasskaya hydropower station in January, 2017. Subsequent hydrobiological studies resulted in re-discovery of three living specimens of the Asian Clam in September, 2017 in the aquatoria below the mouth of the river Manych, located 34 km downstream from the site of the mollusk first record. New materials indicate the expansion of the areal of this invasive species within the Lower Don river system.

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The bivalve Corbicula fluminea (O. F. Müller, 1774) were considered as new alien species for the first time registered in the River Don. One alive specimen was found in the Teplyj Kanal (Warm Channel) near the Novocherkassk hydroelectric power station, and two specimens were observed in the Don main riverbed near the mouth of the Teplyj Kanal. We have considered extended expansion of this species after its first finding in fresh waters of France, Portugal and Germany throughout the European continent towards the area where it was found in the Lower Don.