How to Identify Smooth Oreo

To identify Smooth Oreo (Pseudocyttus maculatus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Typically dark grey to black on the dorsal side, fading to lighter grey or silvery on the ventral side. Often exhibits irregular dark spots or blotches, especially on younger individuals, which can fade with age.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Large, prominent eyes adapted for low light conditions., Deep, compressed body., Rough, spiny scales (though 'smooth' in common name refers to less prominent spines compared to other oreos)., Absence of prominent bony plates or scutes on the body, distinguishing it from some other oreos.

Dorsal fin

Single dorsal fin with 6-8 spines and 30-36 soft rays.

Tail fin

Forked caudal fin.

Pectoral fin

Small, rounded pectoral fins.

Distinctive fins

Anal fin with 2-3 spines and 28-32 soft rays. Pelvic fins are thoracic.

Identification Tips

1. 1

   Body Shape

   Deep, highly compressed body, almost disc-like in appearance.

2. 2

   Eyes

   Very large eyes, characteristic of deep-sea fish.

3. 3

   Coloration

   Dark grey to black, often with faint, irregular dark spots or blotches, especially when young.

4. 4

   Scales

   Rough, ctenoid scales, but less spiny than some other oreo species, giving it its 'smooth' common name.

5. 5

   Fins

   Single dorsal fin, forked caudal fin, and small pectoral fins.

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