“…Since 1970s, the spread of the round goby has been recorded in the Dnieper, Dniester, and Danube rivers [14]. In the Volga River basin, this species was established in the Saratov, Kuybyshev, Cheboksary, and Gorki reser voirs [3,4,6,11,13]. Findings of the round goby were recorded in the Ivankovo and Rybinsk reservoir [5,10,12].…”