The gwyniad (Coregonus pennantii) is a freshwater whitefish native to Bala Lake (Llyn Tegid) in northern Wales. The population is threatened by deteriorating water quality and by the ruffe, a fish introduced to the lake in the 1980s and now eating the eggs and fry of gwyniad. As a conservation measure, eggs of gwyniad were transferred to Llyn Aren...
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http://en.wikipedia.org/wiki/Gwyniad
The gwyniad (Coregonus pennantii) is a freshwater white fish, occurring in Lake Bala in Wales. It is related to the powan.
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http://www.probertencyclopaedia.com/browse/BGA.HTM
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