Gymnocephalus cernuus (Linnaeus, 1758) (ITIS)
Eurasian ruffe
Acerina cernua (Linnaeus, 1758), Acerina czekanowskii (Dybowski, 1874), Acerina fischeri (Eichwald, 1873), Acerina vulgaris (Cuvier in Cuvier and Valenciennes, 1829), Perca cernua (Linnaeus, 1758) (ITIS)
Northern Europe and Asia (NAS Database)
1986 (NAS Database)
Possibly via ballast water (NAS Database)
Competes with native species (NAS Database)
Great Lakes

Eurasian ruffe
Photo by Gary Cholwek; U.S. Geological Survey
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Integrated Taxonomic Information System. Gymnocephalus cernuus. [Accessed Aug 31, 2023].
Nonindigenous Aquatic Species Database. Fact Sheet - Ruffe. USGS, Gainesville, FL. [Accessed Aug 31, 2023].