The capture of a crystal darter Crystallaria asprella, a state endangered species in Missouri, from the main stem of Big River (Meramec River drainage) in August 2009 represented the first documentation of the species in nearly 50 years from Big River, Jefferson County, and only the second record ever reported from this river.

Big River, Crystal darter, Crystallaria asprella, Meramec River, Missouri, rare species
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2010/2011