Ruffe (Gymnocephalus cernua)

General data
- Main name: Ruffe
- Climates: Temperate, Continental, Subpolar
- Habitat: Freshwater
- Native: Europe, Asia
- Introduced: North America
- Distribution: Danube, Volga, Ural, Struma (Strymonas), Lake Vrana, Don, View all... Rhine, Rhone, Dniester, Dnieper, St. Lawrence River, Yenisey, Lake Baikal, Amu Darya, Vistula, Kolyma , River Ob, Loire, River Thames, Neva, Daugava (Western Dvina), Narva, Mezen, Northern Dvina, Gauja, Trent, Great Ouse
Classification
- Genus: Gymnocephalus - Ruffies
- Family: Percidae - Perches
- Order: Perciformes - Perches
- Class: Teleostei - Ray-finned fishes
- Superclass: Osteichthyes - Bony fishes