The Round Goby (Neogobius melanostomus) is a euryhaline bottom-dwelling species of fish of the family Gobiidae. It is native to Central Eurasia, including the Black Sea and the Caspian Sea. Round gobies have established large non-native populations in the Baltic Sea, several major Eurasian rivers, and the North American Great Lakes. (Source is Wikipedia)
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or just Google: Invasive Round Goby
