Provides detailed collection information as well as animated map. The section below contains highly relevant resources for this species, organized by source. Integrated Taxonomic Information System. Gymnocephalus cernuus. [Accessed Aug 31, 2023]. Nonindigenous Aquatic Species Database. Fact Sheet - Ruffe. USGS, Gainesville, FL.

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.

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.

Basic facts about Ruffe: lifespan, distribution and habitat map, lifestyle and social behavior, mating habits, diet and nutrition, population size and status.

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.

Early Detection & Distribution Mapping System. The University of Georgia - Center for Invasive Species and Ecosystem Health. Available online at http://www.eddmaps.org/; last accessed April 7, 2025.

The ruffe or Eurasian ruffe is a small (up to 10 inches; 25 cm) perch-like species that looks like a cross between a sauger, walleye and a perch. It is olive-brown to golden-brown on its back with yellowish white undersides.

Jan 3, 2025 · A map with known hotspots for Ruffe. These are locations where Diamond Ruffe have been caugth, but they don't guarantee a Diamond Rank catch. Also, other ranks of Ruffe can be caught at these locations.

Ruffe are currently spreading throughout the southwestern regions of Lake Superior, and have also been found in Lake Superior's northern coast near Thunder Bay, Canada, and in Lake Huron at the mouth of Thunder Bay River, Michigan (click on map for an enlarged view).

EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org State Lists - This map identifies those states that have this …