Southern sand darter

The southern sand darter (Ammocrypta meridiana) is a species of perch found in the Mobile Bay drainages in Alabama and Mississippi, namely the Alabama and the Tombigbee River systems. It inhabits sandy sections of flowing waters from streams to large rivers. This species can reach a length of 7.1 cm (2.8 in), though most are only about 7 cm (2.8 in) in length.