freshwater
Green Sunfish
Lepomis cyanellus
The Green Sunfish has a stocky, oblong, and somewhat compressed body. It has a larger mouth than many other sunfishes, extending back to at least the front margin of the eye. Coloration is typically olive-green on the back, fading to yellowish-green on the sides with numerous emerald and blue flecks or streaks, especia…
- Habitat
- Native to North America, particularly the Mississippi Ri…
- Size & weight
- Typically ranges from 4 to 7 inches in length and weighs…
- Diet
- Carnivorous, feeding primarily on aquatic insects, crust…
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Physical characteristics
The Green Sunfish has a stocky, oblong, and somewhat compressed body. It has a larger mouth than many other sunfishes, extending back to at least the front margin of the eye. Coloration is typically olive-green on the back, fading to yellowish-green on the sides with numerous emerald and blue flecks or streaks, especially on the opercle (gill cover) flap and cheeks. The fins often have yellowish or orange margins.
Habitat & distribution
Native to North America, particularly the Mississippi River basin and the Great Lakes, preferring slow-moving streams, rivers, ponds, and small lakes. They are highly adaptable and thrive in sluggish, turbid waters with plenty of cover such as submerged logs, rocks, and aquatic vegetation.
Behavior
Solitary for much of the year, becoming more active and territorial during the breeding season. They are primarily diurnal, meaning they are most active during daylight hours.
Diet
Carnivorous, feeding primarily on aquatic insects, crustaceans, small fish, and occasionally snails. They use an ambush feeding strategy near cover.
Reproduction
Males construct saucer-shaped nests in shallow water by sweeping away debris with their tails. Females deposit eggs in the nests, which the males aggressively guard and fan until hatching.
Ecological role
Acts as both predator and prey in freshwater ecosystems, helping regulate aquatic insect populations while serving as a food source for larger fish, wading birds, and aquatic mammals.
Similar species
Bluegill (Lepomis macrochirus) and Pumpkinseed (Lepomis gibbosus). Green sunfish can be distinguished by their larger mouths, longer body shape, and distinct turquoise facial streaks.
Identification tips
Look for a large mouth extending past the eye, turquoise/blue facial streaks, an dark opercular flap with a light-colored margin, and a somewhat elongated sunfish body shape.
Interesting facts
Green sunfish are remarkably resilient and can tolerate low oxygen levels, high temperatures, and poor water quality better than many other native sunfish species.