The redear sunfish (Lepomis microlophus), also known as the shellcracker, Georgia bream, cherry gill, chinquapin, improved bream, and sun perch, is a freshwater fish in the family Centrarchidae and is native to the southeastern United States. Due to its popularity as a sport fish, it has been widely introduced across North America.
Illustration of the redear sunfish, Lepomis microlophus
Redear sunfish generally resemble bluegill except for coloration and somewhat larger maximum size. The redear sunfish also has faint vertical bars traveling downwards from its dorsal.[3] It is dark-colored dorsally and yellow-green ventrally. Unlike bluegill, the male has a cherry-red edge on its operculum; females have orange coloration in this area. The adult fish are between 20 and 24 cm (7.9 and 9.4 in) in length. Max length is 43.2 cm (17.0 in), compared to a maximum of about 40 cm (16 in) for the bluegill. Redear sunfish on average reach about 0.45 kg (0.99 lb), also larger than the average bluegill.[4]
In the wild, redear sunfish inhabit warm, quiet waters of lakes, ponds, streams, and reservoirs. They prefer to be near logs and vegetation, and tend to congregate in groups around these features. This sunfish is also located in many freshwater marsh wetlands.[citation needed]
Diet
The favorite food of this sunfish is snails, which it obtains by cracking their shells, hence this feisty gamefish's common name: shellcracker. These fish meander along lakebeds, seeking and cracking open snails and other shelled creatures. VanderKooy et al. (2000) observed that large L. microlophus predominantly focus on hard-shelled prey such as ostracods, hydrobiid snails and mussels throughout the entire year. In the same field investigation, it was observed that smaller fish tended to also consume zooplankton, amphipods, chironomid and ceratopongonid larvae and cladocerans, with varied distributions depending on the season.[6][7] They are also believed to feed on algae, aquatic worms,[8]copepoda,[8]midgelarvae, ephemeropteran and odonata nymphs, crayfish, small fish, and fish eggs.[citation needed] Redear sunfish have thick pharyngeal teeth which allow them to crunch exoskeletons. They are even capable of opening small clams.[citation needed] The specialization of this species for the deep-water, mollusk-feeding niche allows it to be introduced to lakes without the risk of competition with fish that prefer shallower water or surface-feeding. In recent years, the stocking of redear has found new allies due to the fish's ability to eat quagga mussels, a prominent invasive species in many freshwater drainages.[9]
Reproduction
Male redear sunfish guarding eggs
During spawning, males congregate and create nests close together in colonies, and females visit to lay eggs. The redear sunfish may occasionally hybridize with other sunfish species.[10]
^Gilbert, Carter Rowell; James D. Williams (2002). "Redear Sunfish". In Alfred A. Knopf (ed.). National Audubon Society Field Guide to Fishes: North America. New York. p. 347.{{cite book}}: CS1 maint: location missing publisher (link)
