Threatened Species Status for Kentucky Arrow Darter With 4(d) Rule; Final rule.

We, the U.S. Fish and Wildlife Service (Service), determine threatened species status under the Endangered Species Act of 1973 (Act), as amended, for Kentucky arrow darter (Etheostoma spilotum), a fish species from the upper Kentucky River basin in Kentucky. The effect of this regulation will be to add this species to the List of Endangered and Threatened Wildlife. We are also adopting a rule under section 4(d) of the Act (a ``4(d) rule'') to further provide for the conservation of the Kentucky arrow darter.