How to Identify Blue Tang

To identify Blue Tang (Paracanthurus hepatus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Vibrant royal blue body, bright yellow caudal fin, and a distinctive black mark resembling a painter's palette extending from the eye to the caudal peduncle, often wrapping around the dorsal and anal fins. Juveniles are typically bright yellow with blue-tipped fins and a small black spot at the base of the caudal fin, gradually changing to adult coloration.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Laterally compressed, oval-shaped body, Small, protractile mouth, Scalpel-like spines on either side of the caudal peduncle, Continuous dorsal fin and anal fin

Dorsal fin

Single, continuous dorsal fin with 9 dorsal spines and 26-28 soft rays.

Tail fin

Lunate (crescent-shaped) caudal fin, bright yellow.

Pectoral fin

Small, fan-like pectoral fins.

Distinctive fins

The caudal peduncle features a pair of sharp, retractable, scalpel-like spines, characteristic of surgeonfish, which are used for defense.

Identification Tips

1. 1

   Coloration

   The striking royal blue body, yellow tail, and black 'palette' mark are highly distinctive for adults. Juveniles are yellow with blue accents.

2. 2

   Body Shape

   Its highly compressed, disc-like body is typical of surgeonfish.

3. 3

   Caudal Spine

   The presence of a sharp, retractable spine on each side of the caudal peduncle confirms it as a surgeonfish. This spine is often dark blue or black.

Explore Blue Tang