ExploreFish

Redear Sunfish

lepomis microlophus

The Redear Sunfish, affectionately known by anglers as the 'shellcracker,' is a vibrant and robust freshwater fish native to the southeastern United States. Renowned for its unique diet and strong fighting ability on light tackle, this species has become a beloved target for sport fishers. Unlike many of its sunfish relatives that dart around the upper water column feeding on floating insects, the redear prefers to stealthily patrol the bottom in search of hard-shelled prey. What truly sets this fish apart is its specialized anatomy—a set of powerful, flat teeth located in its throat that allows it to effortlessly crush snail shells. This unique ecological niche makes the Redear Sunfish not only an interesting biological specimen but also a highly valuable natural pest controller in many aquatic environments, helping to keep snail populations in check and reducing the spread of certain aquatic parasites.

Habitat: Found primarily in warm, sluggish waters of lakes, ponds, and slow-moving rivers, preferring areas with abundant aquatic vegetation, submerged stumps, and a muddy or sandy bottom.

Appearance

The Redear Sunfish boasts a deep, laterally compressed body typical of sunfishes, featuring an olive-green to bronze back that transitions into paler, yellow-green sides adorned with darker, mottled spots. Its most defining field mark is the opercular flap (the 'ear'), which is black and famously edged with a bright cherry-red or vivid orange crescent in adult males, and a lighter orange in females. The breast is often a bright yellow or yellowish-orange, while the dorsal fin is continuous, containing both spiny and soft rays. Compared to the closely related bluegill, it generally lacks vertical barring and has a slightly more elongated, pointed snout suited for bottom-feeding.

KingdomAnimaliaPhylumChordataClassActinopterygiiOrderCentrarchiformesFamilyCentrarchidaeGenusLepomis

Redear Sunfish

Interesting facts

Anglers commonly refer to the Redear Sunfish as the 'shellcracker' because, in quiet waters, one can sometimes hear the fish actually cracking snail shells underwater when feeding.

The red or orange edge on the gill cover that gives the 'redear' its name is noticeably brighter and more vivid in males, especially during the breeding season.

They are frequently introduced into private ponds and lakes not just for fishing, but specifically to break the lifecycle of the 'yellow grub,' a fish parasite that relies on snails as an intermediate host.

Unlike many other sunfishes that eagerly strike surface lures, Redears rarely feed at the top of the water column, strongly preferring to hunt along the bottom.

Special abilities

Possesses a specialized set of flat, molar-like teeth in its throat designed specifically to crack open the tough shells of snails and small clams.

By heavily consuming aquatic snails, which act as intermediate hosts for various fish and bird parasites, they naturally regulate and break the lifecycle of aquatic diseases.

Males sweep out saucer-shaped depressions in the substrate to create nests, clustering them closely together in large colonies to cooperatively defend their eggs from predators.

Measurements & details

Length: 20-30 cm
Weight: 0.2-1.5 kg
Lifespan: 5-8 years
Clutch Size: 10000-60000
Incubation: 2-4 days

Diet & Feeding

A specialized benthic predator that feeds almost exclusively on hard-shelled invertebrates and bottom-dwelling aquatic insects.

Age differences: Juveniles feed heavily on microcrustaceans and soft-bodied insects, transitioning almost entirely to hard-shelled prey as their pharyngeal jaws develop.

Primary Foods

Aquatic snails
Small clams
Midge larvae
Amphipods
Dragonfly nymphs

Foraging Method

Foraging

Ecological connections

eaten by

Largemouth Bass

Micropterus salmoides

Largemouth Bass are a primary apex predator in their shared habitats, heavily preying upon juvenile Redear Sunfish.

hunts

Tadpole Snail

Physella gyrina

Redear Sunfish actively hunt and consume Tadpole Snails, keeping their populations in check.

competitor

Bluegill

Lepomis macrochirus

Bluegills share the same habitats and spawning grounds, often competing for nesting sites and occasionally hybridizing.

Traits

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Also known as

No aliases listed yet.

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Safety

Danger

1/5 · Very low

No special safety notes yet.

Frequently Asked Questions

How to identify Redear Sunfish?

The easiest way to identify Redear Sunfish is to use the Snappit nature identifier app.

How long is Redear Sunfish?

20-30 cm

How much does Redear Sunfish weigh?

0.2-1.5 kg

How long does Redear Sunfish live?

5-8 years

What does Redear Sunfish eat?

A specialized benthic predator that feeds almost exclusively on hard-shelled invertebrates and bottom-dwelling aquatic insects.

Where is Redear Sunfish usually found?

Found primarily in warm, sluggish waters of lakes, ponds, and slow-moving rivers, preferring areas with abundant aquatic vegetation, submerged stumps, and a muddy or sandy bottom.

How does Redear Sunfish hunt?

Foraging

How many eggs does Redear Sunfish lay?

10000-60000