How to Identify Trout-perch

To identify Trout-perch (Percopsis omiscomaycus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Generally translucent to silvery-white on the belly, transitioning to olive-brown or yellowish-brown on the back and sides. Often marked with several rows of small, dark spots or blotches along the sides, sometimes forming indistinct bars. The fins are typically clear or slightly dusky.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Presence of an adipose fin (a small, fleshy fin without rays, located between the dorsal and caudal fins), a characteristic shared with salmonids., Large, prominent eyes, adapted for low-light conditions., Rough, ctenoid scales, giving a sandpaper-like feel., A single, short dorsal fin and a small anal fin., Forked caudal fin.

Dorsal fin

Single, short dorsal fin with 1-3 spines and 10-12 soft rays. An adipose fin is present posterior to the dorsal fin.

Tail fin

Moderately forked caudal fin.

Pectoral fin

Pectoral fins are relatively large and low-set, with 11-14 rays.

Distinctive fins

Pelvic fins are abdominal, located well behind the pectoral fins, with 1 spine and 8 rays. Anal fin has 1-2 spines and 6-8 soft rays.

Identification Tips

1. 1

   Adipose Fin

   The most definitive feature; look for the small, fleshy fin between the dorsal and caudal fins, similar to trout and salmon.

2. 2

   Scales

   Feel the body; the scales are ctenoid (rough to the touch), unlike the smooth cycloid scales of most trout.

3. 3

   Eyes

   Noticeably large eyes relative to its head size, indicative of its nocturnal habits.

4. 4

   Coloration and Markings

   Silvery-olive body with rows of small, dark spots or blotches along the sides.

5. 5

   Size

   Typically small, rarely exceeding 15 cm (6 inches) in length.

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