freshwater
Bluegill
Lepomis macrochirus
Deep, compressed, oval-shaped body with a small mouth. Features a dark opercular flap (ear flap) with no distinct light border, vertical bars along the sides that may fade in adults, and a dark spot at the rear base of the dorsal fin.…
- Habitat
- Freshwater lakes, ponds, slow-moving streams, and rivers…
- Size & weight
- Typically 4 to 12 inches in length and weighing between…
- Diet
- Opportunistic feeder consuming aquatic insects, small cr…
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Physical characteristics
Deep, compressed, oval-shaped body with a small mouth. Features a dark opercular flap (ear flap) with no distinct light border, vertical bars along the sides that may fade in adults, and a dark spot at the rear base of the dorsal fin. Coloration varies from olive-green to bluish-purple on the sides with a yellowish or whitish belly.
Habitat & distribution
Freshwater lakes, ponds, slow-moving streams, and rivers with abundant aquatic vegetation, submerged logs, or structures. Native to North America east of the Rocky Mountains.
Behavior
Social fish that typically forms loose schools, often active during daylight hours, and becomes more sedentary at night.
Diet
Opportunistic feeder consuming aquatic insects, small crustaceans, zooplankton, small fish, and plant matter.
Reproduction
Spawns in the spring and summer in shallow water where males construct circular nests in colonies on the sandy or gravelly bottom, guarding the eggs aggressively until hatching.
Ecological role
Serves as a crucial forage species for larger freshwater predators like largemouth bass and various birds; also helps control insect populations.
Similar species
Pumpkinseed (Lepomis gibbosus) which has a red or orange spot on the ear flap; Green Sunfish (Lepomis cyanellus) which has a larger mouth and longer body.
Identification tips
Look for the solid dark ear flap without a bright margin, the dark spot at the base of the dorsal fin, and the deep, laterally compressed body shape.
Interesting facts
Bluegills are known to hybridize readily with other sunfish species such as the green sunfish and pumpkinseed, creating offspring with mixed physical characteristics.