How to Identify Rock Beauty

To identify Rock Beauty (Holacanthus tricolor), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Juveniles are entirely bright yellow with a prominent black spot at the base of the dorsal fin. As they mature, the anterior half of the body remains bright yellow, while the posterior half, including the dorsal, anal, and caudal fins, becomes velvety black. The pectoral fins are yellow, and the pelvic fins are black. A bright blue margin often outlines the dorsal and anal fins.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Sharp, strong spine at the angle of the preoperculum (gill cover)., Distinctive bicolored pattern of bright yellow anteriorly and black posteriorly in adults., Small mouth with brush-like teeth.

Dorsal fin

Single, long dorsal fin with 14 spines and 17-18 soft rays. The posterior soft-rayed portion is rounded.

Tail fin

Rounded caudal fin, entirely black in adults.

Pectoral fin

Yellow, relatively small and rounded.

Distinctive fins

Anal fin with 3 spines and 18-19 soft rays, also black with a blue margin in adults.

Identification Tips

1. 1

   Coloration

   The most distinguishing feature is the sharp contrast between the bright yellow anterior body and the velvety black posterior body and fins in adults. Juveniles are entirely yellow with a black spot.

2. 2

   Preopercular Spine

   Like all angelfish, it possesses a prominent, sharp spine on the lower margin of the preoperculum, which can be used for defense.

3. 3

   Body Shape

   Laterally compressed, disc-shaped body, typical of angelfish.

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