Gymnocephalus cernuus

Physical features: Similar in appearance to perch with dark spots on body and fins. Rows of dark spots between the spines of the joined dorsal fin.

Habitat: Native to Eurasia. Invasive to the Great Lakes. Found in lakes, quiet pools and streams.

Diet: Aquatic invertebrates

Fun facts: Name rhymes with ?tough?. Competes for food and habitat with native fish. Do not return ruffe to the water if caught.