How to Identify Brown Rockfish

To identify Brown Rockfish (Sebastes auriculatus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Variable, typically mottled brown, olive-brown, or reddish-brown, often with darker blotches or bands. The ventral surface is usually lighter. A key identifying feature is a prominent dark brown or black spot on the operculum (gill cover).

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Prominent dark spot on the operculum (gill cover)., Mottled brown coloration with darker blotches., Relatively large mouth with a slightly projecting lower jaw., Strongly spined head, typical of rockfish.

Dorsal fin

Single, deeply notched dorsal fin with 13 spines and 12-14 soft rays.

Tail fin

Truncate to slightly emarginate caudal fin.

Pectoral fin

Large, rounded pectoral fins with 15-18 rays.

Distinctive fins

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

Identification Tips

1. 1

   Opercular Spot

   Look for a distinct, dark brown or black spot on the operculum (gill cover). This is the most reliable distinguishing feature.

2. 2

   Coloration

   Observe the overall mottled brown to olive-brown body color, often with irregular darker blotches or bands that help it camouflage with rocky substrates.

3. 3

   Head Spines

   Note the presence of strong spines on the head, particularly above the eyes and on the operculum, characteristic of rockfish.

4. 4

   Dorsal Fin

   Count the dorsal fin spines (13) and rays (12-14). The deeply notched appearance of the dorsal fin is also helpful.

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