| Impact ID | 7740 |
| Impact Type | Predation/Herbivory |
| Study Type | Anecdotal |
| Study Location | N/A |
| Impact Description | There has been a great deal of concern that ruffe (Gymnocephalus cernua) may have a detrimental effect on more desirable species in Lake Superior, including yellow perch (Perca flavescens) and walleye (Sander vitreus), by feeding on the young of these species. |
| Reference | 677 |
| Cost | |
| Location | Lake Superior |