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Trout and salmon thrive in the cold, clear streams found in many mountainous and northern regions of the United States. Americans devote more than 100 million person days per year to angling in streams or lakes for these fish, which are highly valued for their contribution to the economy and culture of the United States. However, dams, water diversions, pollution, and development threaten trout and salmon, which have already disappeared from many of the streams they once inhabited. Climatic warming poses an additional, potentially severe threat to their survival.