Blackfin Darter (Etheostoma nigripinne)

Description: 

The Blackfin Darter is found in the middle and lower Tennessee River Drainage in Alabama, Mississippi, and Tennessee. They live primarily in pools and riffles with slab-rock and gravel substrate. Like other members of the subgenus Catonotus, this species spawns on the underside of flat rocks. As the common name suggests, male Blackfin Darters have black coloration on their fins.