freshwater
Bluegill
Lepomis macrochirus
Deep, compressed, oval-shaped body with a small mouth. Color is typically olive-green on the back with a yellowish belly and 5-9 dark vertical bars on the sides. Features a prominent dark blue or black spot on the opercle (ear flap) and a dark blotch at the posterior base of the dorsal fin.…
- Habitat
- Native to North America, they inhabit lakes, ponds, slow…
- Size & weight
- Typically 6-10 inches in length and weighing 0.5 to 1 po…
- Diet
- Opportunistic omnivore. Diets include aquatic insects, s…
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Physical characteristics
Deep, compressed, oval-shaped body with a small mouth. Color is typically olive-green on the back with a yellowish belly and 5-9 dark vertical bars on the sides. Features a prominent dark blue or black spot on the opercle (ear flap) and a dark blotch at the posterior base of the dorsal fin. Pectoral fins are long and pointed.
Habitat & distribution
Native to North America, they inhabit lakes, ponds, slow-moving rivers, and creeks. They prefer warm, quiet waters with abundant aquatic vegetation, submerged logs, or structures for cover.
Behavior
Highly social fish that often form large schools. They are diurnal, being most active during dawn and dusk. Adults are often territorial, especially during the nesting season.
Diet
Opportunistic omnivore. Diets include aquatic insects, small crustaceans (daphnia, shrimp), small fish, fish eggs, and occasionally plant material. They feed throughout the water column.
Reproduction
Spawning occurs in late spring to summer when water temperatures reach 70-75°F. Males construct circular nests in shallow, sandy, or gravelly flats, often in dense colonies. Males guard the eggs and fry aggressively.
Ecological role
Acts as both a significant prey source for larger predators like largemouth bass and herons, and as a predator of invertebrates. Helps control insect and crustacean populations.
Similar species
Green sunfish (larger mouth, white-tipped fins), Pumpkinseed (red spot on ear flap, turquoise facial streaks), and Redear sunfish (larger, cherry-red edge on opercle).
Identification tips
Look for the solid black opercular flap and the distinct dark smudge/blotch on the soft dorsal fin. Their small, 'bream' type mouth does not extend past the eye.
Interesting facts
Bluegills have been known to live up to 11 years. They are remarkably adapted to see in low light and can move their eyes independently to search for prey and predators simultaneously.