The rock bass (Ambloplites rupestris) is a species of freshwater fish in the sunfish family Centrarchidae of the order Perciformes. It is resident to the Saint Lawrence River”“Great Lakes system as well as the upper and middle Mississippi River basin in North America. It can also be found from Quebec to Saskatchewan in the north down to Missouri and northern Alabama and Georgia in the south.
Reaching a maximum recorded overall length of 17 in (43 cm) and a maximum recorded weight of 3.0 lb (1.4 kg), this fish is the largest and most common of the Ambloplites species. It can live as long as 10 years.
The rock bass prefers clear, rocky, and vegetated stream pools and lake margins and its diet consists of smaller fish, insects, and crustaceans.
A. rupestris is sometimes called the redeye or redeye bass in Canada, but this name refers more properly to Micropterus coosae, a distinct species of Centrarchid native to parts of the American South.
Rafinesque originally assigned the rock bass to Bodianus, a genus of marine wrasses (family Labridae).