How to Identify Korean Perch

To identify Korean Perch (Coreoperca herzi), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

The body is typically olive-brown to greenish-gray on the dorsal side, fading to a lighter, yellowish-white on the ventral side. It is characterized by 7-9 irregular, dark vertical bands or blotches along the flanks, which can vary in intensity. The fins often have a reddish or yellowish tint, especially during breeding season. A prominent dark spot or ocellus is often present on the operculum (gill cover).

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Robust, slightly compressed body, Large mouth extending to below the eye, Two distinct dorsal fins (spiny and soft-rayed), Prominent dark vertical bands on flanks, Dark opercular spot

Dorsal fin

Two dorsal fins, broadly joined at the base. The first dorsal fin has 10-11 strong, sharp spines. The second dorsal fin has 1 spine and 10-12 soft rays.

Tail fin

Caudal fin is slightly emarginate to rounded, with 15-17 branched rays.

Pectoral fin

Pectoral fins are relatively large and rounded, with 13-15 rays.

Distinctive fins

Pelvic fins are thoracic, located below the pectoral fins, with 1 spine and 5 soft rays. Anal fin has 3 spines and 7-9 soft rays.

Identification Tips

1. 1

   Body Shape and Coloration

   Look for the robust, slightly elongated body with distinct dark vertical bands (7-9) on an olive-brown to greenish-gray background. The belly is lighter.

2. 2

   Dorsal Fins

   Note the two distinct dorsal fins, with the first being spiny and the second soft-rayed, but broadly connected.

3. 3

   Opercular Spot

   A prominent dark spot on the gill cover (operculum) is a key identifying feature.

4. 4

   Mouth Size

   Its large mouth, extending to below the eye, indicates its predatory nature.

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