Definition of "ruffe" []

• A fish, the Eurasian ruffe (Gymnocephalus cernuus) and other species in the same genus. (noun)

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• "The introduction of another fish called the ruffe, which preys upon the eggs and young Gwyniads, has seen their numbers fall to as low as 31 females since the 1980s."
• "Several species in the Yenisey and Lena Rivers that prefer warmer boreal-plain habitats (e.g., roach, ide, common dace – Leuciscus leuciscus baicalensis, European perch, and ruffe – Gymnocephalus cernuus) are likely to move into the northern mouth areas of these rivers that are currently dominated by whitefishes and chars."
• "For example, in Loch Lomond in Scotland the invasive ruffe (Gymnocephalus cernuus) eats the eggs of an arctic relict species, the powan (Coregonus lavaretus), thereby threatening this species in one of its only British habitats [66]."