Ambloplites is a genus of North American freshwater fish in the sunfish family (Centrarchidae) of order Perciformes. The type species is A. rupestris, the rock bass, and the species of this genus are known collectively as the rock basses. The various Ambloplites species, which grow to a maximum overall length of 30–43 cm (12–17 in) and a maximum weight of 0.45–1.4 kg (0.99–3.09 lb), depending on species, are native to a region extending from the Hudson Bay basin in Canada to the lower Mississippi River basin in the United States.