Gymnocephalus
3 species
Gymnocephalus is a genus of ray-finned fishes from the family Percidae, which includes the perches, pike-perches and darters. They are from the Western Palearctic area, although one species, Gymnocephalus cernua has been accidentally introduced to the Great Lakes region where it is regarded as an invasive species. They have the common name "ruffe" and resemble the true perches in the genus Perca, but are usually smaller and have a different pattern.
The species in the genus Gymnocephalus are found in Europe and one species, G. cernua having been accidentally introduced to North America in ballast water, originating form the river Elbe in Germany, near the mouth of the St Louis River in Lake Superior. This species has also been introduced outside of its native range in Europe.
Gymnocephalus is a genus of ray-finned fishes from the family Percidae, which includes the perches, pike-perches and darters. They are from the Western Palearctic area, although one species, Gymnocephalus cernua has been accidentally introduced to the Great Lakes region where it is regarded as an invasive species. They have the common name "ruffe" and resemble the true perches in the genus Perca, but are usually smaller and have a different pattern.
The species in the genus Gymnocephalus are found in Europe and one species, G. cernua having been accidentally introduced to North America in ballast water, originating form the river Elbe in Germany, near the mouth of the St Louis River in Lake Superior. This species has also been introduced outside of its native range in Europe.
