An endangered freshwater mussel species in the Big South Fork National River & Recreation Area is showing signs of natural population increases for the first time. The tan riffleshell (Epioblasma walkeri) is an endangered mussel found in only a few locations within the Big South Fork of the Cumberland and the upper Clinch Rivers. https://www.nps.gov/biso/learn/news/endangered-freshwater-species-shows-signs-of-population-increases.htm
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