The redear sunfish is deep and slab-sided, with a small mouth, the upper jaw not reaching past the front of the eye. The back and sides are golden or light olive green. The belly is yellow or orange yellow. The sides often have dark vertical bars. The ear flap is black with a whitish border and a prominent orange or red spot. It is most closely related to bluegill, green sunfish, and other sunfishes.
Total length: 8 to 10½ inches; weight: 6½ to 12 ounces; can be more than 12 inches and more than 4 pounds.
In natural waters, this species is confined to the southern half of Missouri, but it has been widely stocked in small reservoirs and ponds.
Habitat and Conservation
This sunfish prefers warm, clear waters with no noticeable current and an abundance of aquatic plants. In streams, it prefers protected bays and overflow pools and avoids the main channel. Most active in daylight.
Carnivorous, feeding primarily on snails and other mollusks. This diet is what inspired the alternate common name "shellcracker." The throat teeth of this fish have broad, flattened surfaces, which are well suited for crushing mollusk shells.
Individuals can live for 6 years. In our state, nesting is in May or June, and sometimes again in August. Nests are saucer-shaped depressions that are fanned out in silt if no gravel is present. This species nests in colonies, with the rims of the nests often almost touching.
An excellent panfish, the redear sunfish contributes significantly to the creel in impounded waters where it has been introduced. Most are caught from spawning "beds" in early summer. Can be taken on artificial lures, but natural baits, such as earthworms and grubs, are most effective.
Stocked in many small ponds and fish hatcheries to control the spread of certain aquatic parasites. Redear prey upon aquatic snails, which are an important link in the lifecycles of certain aquatic parasites.