freshwater
Bluegill
Lepomis macrochirus
Deep, compressed, oval-shaped body with a small mouth. It features distinctive dark spots at the rear base of the dorsal fin and a dark, elongated opercular flap (ear flap) without a light border.…
- Habitat
- Native to North America, typically inhabiting warm, quie…
- Size & weight
- Typically 4 to 12 inches (10 to 30 cm) in length and wei…
- Diet
- Opportunistic feeder consuming a wide variety of foods i…
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Physical characteristics
Deep, compressed, oval-shaped body with a small mouth. It features distinctive dark spots at the rear base of the dorsal fin and a dark, elongated opercular flap (ear flap) without a light border. Coloration varies from olive-green to bluish-black on the back, fading to yellowish-white on the belly, with vertical bars often present on the sides.
Habitat & distribution
Native to North America, typically inhabiting warm, quiet waters of lakes, ponds, slow-moving streams, and rivers with abundant aquatic vegetation or submerged structures like logs and docks.
Behavior
Social fish that often forms loose schools, especially younger individuals. They are primarily diurnal, active during daylight hours, and become sedentary at night.
Diet
Opportunistic feeder consuming a wide variety of foods including aquatic insects, small crustaceans, snails, zooplankton, and small fish.
Reproduction
Spawns in the spring and summer. Males construct circular nests in shallow water colonies and aggressively guard the eggs and newly hatched fry from predators.
Ecological role
Serves as a crucial link in the aquatic food web, acting as an important prey species for larger predatory fish and birds while helping regulate insect and zooplankton populations.
Similar species
Pumpkinseed (Lepomis gibbosus), which has a red or orange spot on the ear flap and wavy turquoise lines on the cheeks; Green Sunfish (Lepomis cyanellus), which has a larger mouth and a longer, slender body.
Identification tips
Look for the distinct dark blue or black ear flap, the dark blotch at the back of the dorsal fin, and the compressed, nearly round body shape.
Interesting facts
Male bluegills build shallow nests close together in colonies, and larger males use sophisticated tactics to protect their territory while sometimes dealing with sneaker males that dart in to fertilize eggs.