How to Identify Moorish Idol

To identify Moorish Idol (Zanclus cornutus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Distinctive pattern of broad, vertical black and white (or yellowish-white) bands. The anterior black band covers the eye, and a posterior black band extends onto the anal fin. The snout is often yellow, and there is a prominent orange-yellow saddle on the snout and between the eyes. The caudal fin is black.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Extremely elongated, whip-like dorsal fin filament, which can be longer than the body itself., Small, tubular snout with a small mouth., A pair of horn-like projections (cornutus) above the eyes, more prominent in adults., Laterally compressed, disc-shaped body.

Dorsal fin

5-7 spines, 39-43 soft rays; the third or fourth dorsal spine is greatly elongated into a trailing filament.

Tail fin

Truncate to slightly emarginate.

Pectoral fin

16-18 rays.

Distinctive fins

Pelvic fins are small and black, often with a white leading edge. Anal fin has 3 spines and 31-37 soft rays.

Identification Tips

1. 1

   Coloration and Pattern

   The bold black, white, and yellow banding is unmistakable. No other fish has this exact combination and pattern.

2. 2

   Dorsal Fin Filament

   The extremely long, trailing dorsal fin filament is a definitive characteristic, especially in adults.

3. 3

   Body Shape

   Its highly compressed, disc-like body shape further aids in identification.

4. 4

   Snout and Horns

   The small, tubular snout and the presence of supraorbital 'horns' (especially in larger individuals) are key features.

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