Gymnocephalus cernuus


Photo credit: ©John D. Lyons
Gymnocephalus cernuus
  • The ruffe lives in freshwater ecosystems.

  • This is a small species of fish generally reaching only up to 20 cm in length. It is brownish in colour with dark spots over its body. Ruffe have large spiny dorsal fin which is fused

Origin and Distribution:
  • Native to Europe and Asia. This species has become invasive in parts of continental Europe, Britain and also the Great Lakes in North America

  • The rapid growth and reproduction rate of this species impacts on fish communities as food and resources for native and desirable fish species become reduced. Fish eggs are also a target food source for this species

How might it get here?
  • Introductions of this species are generally accidental or unintentional. This species can be introduced as live bait or in ballast water

Is it found in Ireland or Northern Ireland?:
  • Not present in Ireland or Northern Ireland.

Prevent Spread:

  • Do not introduce non-native fish species.
  • Do not move species of fish from one waterbody to another.
  • Do not use live bait.
  • Report all sightings to CEDaR.

Contacts/further information  
Invasive Species Ireland

Invasive Species Ireland