"Pope" Fish Invades Non-Native Land
Eurasian Ruffe is on the loose!
Common names: Ruffe or Pope
Scientific Names: Gymnocephalus cernua
Phylum/Division: Kingdom: Animalia
colors and markings are similar to those of the walleye, an olive-brown to golden-brown color on its back, paler on the sides with yellowish white undersides.
4–6 inches (10–15 cm) long and will never exceed 10 in (25 cm)
two fins on top
front fin has hard and sharp spines
back fin has soft spines called rays
large, continuous dorsal fin and its slightly downturned mouth.
Local fisherman have ried to control ruffe by increasing the number of its predators, especially walleye and northern pike. They did this by limiting sport catches of these species, and stocking walleye and northern pike.
Control Level Diagnosis:
Reason why it is established:
Ruffe grow quickly, have a high reproductive capacity, and can live in a wide variety of environments.
Based on population size and diet, ruffe should reduce food sources for many fish.
Ruffe grow quickly, have a high reproductive capacity, and can live in a wide variety of environments. These qualities give populations of ruffe the potential disrupt the delicate predator/prey balance vital to sustaining a healthy fishery.