How to Identify Pearl Perch

To identify Pearl Perch (Glaucosoma scapulare), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Silvery-grey to brownish-grey dorsally, fading to silvery-white ventrally. A prominent, iridescent pearly-white spot is located on the shoulder, just above the pectoral fin base. Fins are typically dusky or yellowish.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Prominent pearly-white spot on the shoulder (scapular region)., Large eyes relative to head size., Deep, compressed body., Large, ctenoid scales.

Dorsal fin

Single dorsal fin with 8 spines and 10-11 soft rays. The spinous portion is strong and continuous with the soft-rayed portion.

Tail fin

Caudal fin is emarginate (slightly forked) to truncate.

Pectoral fin

Pectoral fins are relatively long and pointed.

Distinctive fins

Pelvic fins are thoracic, located directly below the pectoral fins, with 1 spine and 5 soft rays. Anal fin has 3 spines and 9-10 soft rays.

Identification Tips

1. 1

   Pearly Spot

   The most definitive feature is the iridescent, pearly-white spot located on the upper shoulder, just behind the gill cover and above the pectoral fin base. This spot is usually quite distinct and can be seen even on freshly caught specimens.

2. 2

   Body Shape and Coloration

   Look for a deep, compressed body with a silvery-grey to brownish-grey back and silvery-white belly. The overall appearance is robust.

3. 3

   Fin Structure

   Note the single, continuous dorsal fin with strong spines and the slightly forked to truncate caudal fin.

4. 4

   Large Eyes

   Pearl Perch have relatively large eyes, which is common for fish inhabiting deeper reef environments.

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