How to Identify Ruffe

To identify Ruffe (Gymnocephalus cernua), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dorsal side is typically olive-brown to greenish-brown, fading to yellowish-white or silvery on the belly. Irregular dark blotches or spots are often present on the sides and dorsal fin. The fins are generally dusky.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Single, continuous dorsal fin with a spiny anterior portion and a soft-rayed posterior portion, appearing as one long fin., Large, prominent eyes., Rough, ctenoid scales., Preopercle (bone below the eye) has sharp spines., Slightly humped back profile.

Dorsal fin

Single, long dorsal fin with 11-16 strong, sharp spines followed by 11-13 soft rays. The spiny and soft-rayed portions are broadly connected.

Tail fin

Slightly forked or emarginate caudal fin.

Pectoral fin

Rounded pectoral fins.

Distinctive fins

Pelvic fins are thoracic, located directly below the pectoral fins. Anal fin has 2-3 spines and 5-6 soft rays.

Identification Tips

1. 1

   Dorsal Fin

   Look for a single, continuous dorsal fin that is deeply notched, with a spiny front portion and a soft-rayed rear portion. The spines are very sharp.

2. 2

   Eyes

   Ruffe have noticeably large, somewhat bulging eyes.

3. 3

   Preopercle Spines

   Feel or observe the sharp spines on the preopercle bone, located just below the eye and along the cheek.

4. 4

   Coloration and Pattern

   Olive-brown to greenish-brown back with irregular dark blotches or spots, fading to a lighter belly.

5. 5

   Body Shape

   A somewhat humped back and a generally elongated, perch-like body.

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