How to Identify Green Sunfish

To identify Green Sunfish (Lepomis cyanellus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Olive-green to brown on the back, fading to lighter green or yellow on the sides, and a white to yellow belly. Iridescent blue-green spots and streaks are often present on the head and operculum. The opercular flap is typically black with a pale (often orange or red) margin. Fins are often dusky, with the dorsal, anal, and caudal fins sometimes having a yellowish or orange tint.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Large mouth extending to or beyond the front of the eye., Short, rounded pectoral fins., Black opercular flap with a distinct pale margin (often orange or red)., Iridescent blue-green spots and streaks on the head and operculum., Typically 3 anal fin spines.

Dorsal fin

Single, continuous dorsal fin with 10-11 spines and 10-12 soft rays. The spiny and soft-rayed portions are broadly connected.

Tail fin

Slightly forked to rounded caudal fin.

Pectoral fin

Short and rounded, typically with 13-14 rays.

Distinctive fins

Anal fin with 3 spines and 9-11 soft rays. Pelvic fins are thoracic.

Identification Tips

1. 1

   Mouth Size

   The mouth is relatively large, extending to or past the anterior margin of the eye, a key differentiator from most other Lepomis species.

2. 2

   Opercular Flap

   The black opercular flap (ear flap) has a distinct, often bright, pale margin (orange, red, or yellow), which is a reliable identification mark.

3. 3

   Body Coloration and Markings

   Look for the olive-green to brown body with iridescent blue-green spots and streaks on the head and gill covers. The belly is typically yellowish.

4. 4

   Pectoral Fins

   Green Sunfish have short, rounded pectoral fins, unlike the longer, pointed pectoral fins of many other sunfish species.

5. 5

   Anal Fin Spines

   Count the anal fin spines; Green Sunfish typically have 3, whereas many other sunfish have 3 or more.

Explore Green Sunfish