Green Sunfish
Lepomis cyanellus
Type: freshwater
Physical Characteristics
Deep-bodied, laterally compressed with a thick profile and a large mouth. Coloration is olive to green with iridescent blue speckling and streaks on the face. Fins often have yellow or white edges and there is a prominent dark spot on the rear of the dorsal and anal fins.
Habitat & Distribution
Inhabits sluggish streams, ponds, lakes, and reservoirs across North America. It is highly tolerant of turbidity and poor water quality, often preferring areas with heavy vegetation or rocky cover.
Size & Weight
Typically ranges from 3 to 7 inches in length. Max recorded size is approximately 12 inches and weight can reach up to 2 pounds, though 0.5 pounds is common.
Similar Looking Species
Bluegill (Lepomis macrochirus) - has a smaller mouth and vertical bars; Warmouth (Lepomis gulosus) - has a tooth patch on the tongue and different markings.
Ecological Role
Serves as both a mid-level predator and a prey species. It helps control populations of aquatic insects and small invertebrates but can become invasive or stunted in small ponds due to high reproductive rates.
Diet
An opportunistic generalist that feeds on aquatic and terrestrial insects, small crustaceans, small fish, and larvae.
Behavior
Known for being highly aggressive and territorial. They are often solitary but may congregate around prime feeding structure; primarily diurnal hunters.
Reproduction
Males build circular nests in shallow water, often in colonies. Spawning occurs throughout the summer when water temperatures rise. Males guard the eggs and fry aggressively.
Conservation Status
Least Concern (IUCN). Populations are stable and widespread, often expanding into new areas as an introduced species.
Identification Tips
Look for the unusually large mouth for a sunfish (extending to the middle of the eye), blue iridescent streaks on the cheek, and yellow-orange margins on the fins.
Interesting Facts
The Green Sunfish is known for its ability to survive in very small, isolated bodies of water where other fish cannot. It hybridizes very easily with other members of the Lepomis genus, such as Bluegill and Redear Sunfish.
Identified on: 5/26/2026
Mode: Standard