How to Identify Yellowtail Tang

To identify Yellowtail Tang (Zebrasoma xanthurum), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

The body is a deep, vibrant purple to dark blue, often appearing almost black in certain lighting. The caudal fin (tail) is a striking bright yellow. A small, bright yellow spot is typically present at the base of the pectoral fin. The dorsal and anal fins are edged in blue.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Vibrant purple/blue body coloration, Bright yellow caudal fin, Elongated snout, Scalpel-like spine on each side of the caudal peduncle

Dorsal fin

Continuous dorsal fin with 4-5 spines and 23-25 soft rays. The fin is relatively tall and sail-like.

Tail fin

Lunate (crescent-shaped) and bright yellow.

Pectoral fin

Relatively small, clear to slightly yellowish, with a small yellow spot at the base.

Distinctive fins

The dorsal and anal fins are tall and sail-like, giving the fish a disc-like appearance when fully extended. The caudal peduncle bears a sharp, retractable scalpel-like spine on each side.

Identification Tips

1. 1

   Body Color

   Look for the intense purple-blue body color, which can sometimes appear darker depending on lighting and the fish's mood.

2. 2

   Tail Color

   The bright yellow caudal fin is a definitive characteristic and contrasts sharply with the body.

3. 3

   Snout Shape

   Observe the elongated, pointed snout, typical of Zebrasoma species, which aids in grazing algae from crevices.

4. 4

   Caudal Spine

   Note the presence of a sharp, retractable spine (scalpel) on each side of the caudal peduncle (the narrow part connecting the body to the tail). This is a key feature of all surgeonfishes.

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