The redbreast sunfish (Lepomis auritus) is a species of freshwater fish in the sunfish family (family Centrarchidae) of order Perciformes. The type species of its genus, it is native to the river systems of eastern Canada and the United States. The redbreast sunfish reaches a maximum recorded length of about 30 cm (12 in), with a maximum recorded weight of 790 g (1.7 lb). The species prefers vegetated and rocky pools and lake margins for its habitat. A panfish popular with anglers, the redbreast sunfish is also kept as an aquarium fish by hobbyists. It is popular with fly anglers in the winter because it will more readily strike a moving fly than will bluegills in cooler water.Redbreast sunfish has been transplanted to and become established in Germany, Italy, Mexico, and Puerto Rico, sometimes with a harmful effect on native species.