Threatened Species Status With Section 4(d) Rule for Sickle Darter

We, the U.S. Fish and Wildlife Service (Service), determine threatened status under the Endangered Species Act of 1973 (Act), as amended, for the sickle darter (Percina williamsi), a fish species from the upper Tennessee River drainage in North Carolina, Tennessee, and Virginia. This rule adds the species to the List of Endangered and Threatened Wildlife. We also finalize a rule under the authority of section 4(d) of the Act that provides measures that are necessary and advisable to provide for the conservation of the sickle darter.