The US Endangered Species Act (USESA) designated the subspecies O. m. whitei as LT, or Listed Threatened, since 1978, under the name Oncorhynchus aguabonita whitei.
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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.