How to Identify Copper Rockfish

To identify Copper Rockfish (Sebastes caurinus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Highly variable, ranging from dark copper-brown to olive-brown or yellowish-brown on the dorsal surface, fading to lighter shades on the belly. Often marked with irregular, blotchy patches of lighter or darker coloration. A distinctive white or pale stripe typically runs along the lateral line, and another often extends from the eye to the pectoral fin. Fins are usually reddish-brown.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

A prominent white or pale stripe along the lateral line, often broken or blotchy., A pale patch on the lower operculum (gill cover)., A pale blotch on the posterior part of the body, below the soft dorsal fin., Strongly spined head, with nasal, preocular, supraocular, postocular, tympanic, and parietal spines present. Coronal spines are absent., Lower jaw typically projects slightly beyond the upper jaw.

Dorsal fin

13 dorsal spines, 12-14 soft rays. The spinous portion is deeply notched from the soft-rayed portion.

Tail fin

Truncate to slightly emarginate.

Pectoral fin

16-18 rays, relatively large and rounded.

Distinctive fins

Anal fin with 3 spines and 6-8 soft rays. Pelvic fins thoracic with 1 spine and 5 soft rays.

Identification Tips

1. 1

   Lateral Line Stripe

   Look for the distinctive white or pale stripe running along the lateral line. This stripe can be continuous or broken into blotches.

2. 2

   Head Spines

   Observe the arrangement of spines on the head. Copper Rockfish have nasal, preocular, supraocular, postocular, tympanic, and parietal spines, but lack coronal spines.

3. 3

   Coloration and Patches

   Note the overall copper to olive-brown body color, often with lighter blotches. The pale patch on the lower operculum and below the soft dorsal fin are also key identifiers.

4. 4

   Lower Jaw

   The lower jaw typically protrudes slightly beyond the upper jaw.

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