freshwater
Green Sunfish
Lepomis cyanellus
Deep, compressed, oblong body shape with a large mouth and upper jaw extending past the eye. Dark olive-green to bluish-brown back and sides, fading to yellow or white on the belly. Fins often have yellow or orange margins.…
- Habitat
- Found in sluggish streams, rivers, ponds, and lakes with…
- Size & weight
- Typical length is 4 to 7 inches (10-18 cm) with weights…
- Diet
- Carnivorous; feeds primarily on aquatic insects, insect…
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Physical characteristics
Deep, compressed, oblong body shape with a large mouth and upper jaw extending past the eye. Dark olive-green to bluish-brown back and sides, fading to yellow or white on the belly. Fins often have yellow or orange margins. Distinctive blue-green wavy streaks or speckles on the opercle flap and gill covers, and a dark black spot on the rear edge of the gill flap.
Habitat & distribution
Found in sluggish streams, rivers, ponds, and lakes with abundant vegetation, rocky substrates, or submerged debris. Tolerant of low oxygen levels, high turbidity, and temperature fluctuations. Native to central and eastern North America but widely introduced elsewhere.
Behavior
Solitary and territorial outside of the breeding season. Diurnal and most active during daylight hours, often lurking near structures or vegetation to ambush prey.
Diet
Carnivorous; feeds primarily on aquatic insects, insect larvae, small crustaceans, snails, and occasionally small fish. Uses an opportunistic ambush feeding strategy.
Reproduction
Males construct shallow circular depressions in the substrate as nests in colonies during late spring and summer. Males fiercely guard the eggs and fry until they disperse.
Ecological role
Acts as both predator and prey within freshwater food webs. Helps control aquatic insect populations while serving as a food source for larger piscivorous fish and birds.
Similar species
Bluegill (Lepomis macrochirus) and Pumpkinseed (Lepomis gibbosus). Green sunfish are distinguished by their larger mouth, elongated body shape, and turquoise or blue facial streaks.
Identification tips
Look for the larger mouth compared to other sunfish, turquoise facial lines, dark spot on the opercle flap, and yellowish-orange edges on the fins.
Interesting facts
Green sunfish are exceptionally hardy and can survive in harsh aquatic environments where other fish species would perish. They readily hybridize with other sunfish species, such as the bluegill.
Field notes
New Mexico