Redear sunfish

The redear sunfish (Lepomis microlophus), also known as the shellcracker, Georgia bream, cherry gill, chinquapin, stumpknocker, 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.

Distribution

Redear sunfish are native to the southeastern United States. They range from North Carolina to Florida, west to southern Illinois and Missouri, and south to the Rio Grande drainage in Texas. However, this fish has been widely introduced to other locations such as the states of Ohio and Arizona.

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.

Behaviour

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. They are also believed to feed on algae, aquatic worms, copepoda, midge larvae, ephemeropteran and odonata nymphs, crayfish, small fish, and fish eggs. Redear sunfish have thick pharyngeal teeth which allow them to crunch exoskeletons. They are even capable of opening small clams. 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.