S. a. oquassa, known as the Sunapee trout or the blueback trout, is native to eastern Quebec and northern New England, although it has been extirpated from most of its eastern United States range.
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Lake trout, a larger char that holds the same ecological niche as Sunapee trout, only better, out-competed the Sunapee golden trout and hybridized with it, further accelerating its decline.