Coal Darter (Percina brevicauda)

Description: 

The Coal Darter is found in the Cahaba, Coosa, and Black Warrior river systems of the Mobile Basin in central Alabama. They live over gravel substrate of runs and riffles in small to medium rivers. As the common name suggests, breeding male Coal Darters have dark coloration in their fins. While most darters are found on stream bottoms, members of the genus Percina tend to be found higher in the water column because they retain a swim bladder.