The tangerine darter or river slick (Percina aurantiaca) is a small freshwater ray-finned fish in the perch family found in the eastern United States. It grows to a length of 4.3 to 7.1 inches (11 to 18 cm), males being bright orange-red while females are yellow. It is insectivorous, picking insect larvae off aquatic plants and the riverbed, and sometimes rolling small stones over to expose prey. It breeds in late spring and early summer, typically in shallow sandy or gravelly riffles. Pollution and habitat degradation may be a problem in parts of its range, however it is a fairly common fish with a wide range and the International Union for Conservation of Nature has classified its conservation status as being of "least concern".