FIRST FINDINGS OF <i>DREISSENA POLYMORPHA</i> (PALLAS, 1771) IN IRIKLINSKY RESERVOIR
In July 2019, adults of Dreissena polymorpha (Pallas, 1771) were found at five points of the Iriklinsky Reservoir (the upper reaches of the Ural River, Orenburg Region) for the first time. The veligers found also indicate that the zebra mussel formed a self-reproducing population in the Iriklinsky Reservoir. Penetration of D. polymorpha into the Iriklinsky Reservoir went either due to introduction of invertebrates and fish, or with fishing gear or small boats.