The ruffe (Gymnocephalus cernua), also known as the Eurasian ruffe or pope, is a freshwater fish found in temperate regions of Europe and northern Asia. [2] It has been introduced into the Great Lakes of North America, reportedly with unfortunate results, as it is invasive and is reproducing faster than other species.

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Identification: The ruffe is a small fish, reaching 10 inches in length, is olive-brown to golden-brown on its back with yellowish white undersides. Its fused dorsal fins are characterized by 12–19 dorsal spines followed by 11–16 soft dorsal rays. The caudal fin has 16–17 rays.

Species Profile: Eurasian Ruffe. Competes with native species (NAS Database)

The ruffe (pronounced like “rough”) is a small bottom-dwelling fish. They rarely grow bigger than six inches long. They have olive to gold-brown backs with yellow-white undersides, resembling a yellow perch with walleye markings.

The ruffe (Gymnocephalus cernua), also known as the Eurasian ruffe or pope, is a freshwater fish found in temperate regions of Europe and northern Asia. It has been introduced into the Great Lakes of North America, reportedly with unfortunate results, as it is invasive and is reproducing faster than other 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.

Apr 2, 2025 · Ruffe are bottom-living fish in the lower reaches of rivers or lakes. They can be found in small numbers on most canals, especially in the north of England. A 120gm fish was caught on the Shropshire Union Canal in 2023 at the National Celebration of Young People.

Ruffe has been reported from Lake Huron at Thunder Bay River, and in Thunder Bay, Lake Superior, Ontario, Canada. It has become the dominant species in the St. Louis River estuary (McLean 1993) and considered the most abundant of the 60 species found in Duluth Harbor (Ruffe Task Force 1992).

Originally found in rivers, lakes, and brackish coastal waters across Eurasia, the ruffe has garnered attention as an invasive species in North America, where it poses significant ecological challenges.