How to Identify Redear Sunfish

To identify Redear Sunfish (Lepomis microlophus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Olive-green to golden-brown dorsally, fading to lighter sides and a yellowish-white belly. Sides often have faint vertical bars. The most distinguishing feature is the prominent red or orange margin on the posterior edge of the opercular flap (gill cover) in males, which is typically orange or pale in females and juveniles. Pectoral fins are usually clear to yellowish.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Small mouth, with the upper jaw not extending past the front of the eye., Long, pointed pectoral fins., Absence of spots or blotches on the dorsal, caudal, and anal fins (unlike Bluegill)., Pharyngeal teeth are well-developed and molar-like, adapted for crushing snail shells.

Dorsal fin

Single dorsal fin with 10-11 spines and 10-12 soft rays, deeply notched between the spiny and soft-rayed portions.

Tail fin

Slightly forked caudal fin.

Pectoral fin

Long and pointed, extending past the eye when bent forward.

Distinctive fins

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

Identification Tips

1. 1

   Opercular Flap

   Look for the distinctive red (males) or orange/pale (females/juveniles) margin on the posterior edge of the gill cover. This is the most reliable field mark.

2. 2

   Mouth Size

   Redear Sunfish have a relatively small mouth compared to other sunfish, with the upper jaw not extending beyond the front of the eye.

3. 3

   Pectoral Fins

   Their pectoral fins are notably long and pointed, often extending past the eye when pressed forward.

4. 4

   Body Coloration

   Generally olive-green to golden-brown, often with faint vertical bars on the sides. Absence of dark spots on the dorsal, caudal, and anal fins helps distinguish them from Bluegill.

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