How to Identify Orange Roughy

To identify Orange Roughy (Hoplostethus atlanticus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Bright orange-red when alive, fading to a dull orange or pinkish-brown after death. The fins are often darker, sometimes with black margins.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Large, prominent eyes adapted for low light conditions., A bony, rough head with numerous mucous canals and ridges., A series of strong, bony scutes along the ventral midline., A deep body, tapering towards the caudal fin.

Dorsal fin

Single dorsal fin with IV-VII spines and 15-19 soft rays.

Tail fin

Forked caudal fin.

Pectoral fin

Large, fan-like pectoral fins with 15-18 rays.

Distinctive fins

Pelvic fins are thoracic, with I spine and 6 soft rays. Anal fin has III spines and 10-12 soft rays.

Identification Tips

1. 1

   Coloration

   Live specimens are a vibrant orange-red. Post-mortem, the color can fade, but the overall reddish hue is usually retained.

2. 2

   Head Structure

   The head is notably large, bony, and rough to the touch, with prominent mucous canals and ridges.

3. 3

   Eyes

   Very large eyes, characteristic of deep-sea fish, adapted for low light.

4. 4

   Body Shape

   Deep, compressed body that tapers towards the tail.

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