How to Identify Blackbelly Rosefish

To identify Blackbelly Rosefish (Helicolenus dactylopterus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Overall reddish to orange-red, often mottled with darker blotches. The belly is typically paler, but the inside of the mouth and gill cavity are often dark blue to black, giving rise to the 'bluemouth' alternative name. Fins are often reddish with darker margins. A prominent dark blotch is usually present on the operculum.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Large head with prominent eyes., Robust, compressed body., Strongly spined dorsal fin., Dark blotch on the operculum., Dark blue to black coloration inside the mouth and gill cavity (less pronounced in some populations).

Dorsal fin

Single, long dorsal fin with 11-13 strong, venomous spines followed by 11-14 soft rays. The spiny and soft-rayed portions are deeply notched but continuous.

Tail fin

Truncate to slightly emarginate caudal fin.

Pectoral fin

Large, fan-like pectoral fins with 17-20 rays, often reaching beyond the anus.

Distinctive fins

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

Identification Tips

1. 1

   Coloration

   Look for the reddish-orange body, often with darker mottling. The dark blotch on the operculum is a key feature.

2. 2

   Mouth and Gill Cavity

   If possible, observe the inside of the mouth and gill cavity; a dark blue to black coloration is characteristic, though it can be less intense in some individuals or populations.

3. 3

   Dorsal Fin Spines

   Count the strong, venomous spines (11-13) in the dorsal fin. Exercise extreme caution as these are venomous.

4. 4

   Body Shape

   Note the robust, compressed body and large head with prominent eyes.

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