How to Identify Masked Bannerfish

To identify Masked Bannerfish (Heniochus monoceros), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

The body is predominantly white with two broad, diagonal black bands. The first band runs from the nape through the eye to the pectoral fin base. The second band extends from the anterior part of the dorsal fin to the posterior part of the anal fin. The soft dorsal fin, caudal fin, and posterior part of the anal fin are yellow. The snout is dark, often blackish. Juveniles have a less pronounced 'horn' and may have a more intense yellow coloration.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

A prominent, bony protuberance (horn) on the forehead, which is more developed in adults., Elongated fourth dorsal fin spine, forming a banner-like filament., Two broad, diagonal black bands on a white body background.

Dorsal fin

Dorsal fin with 11-12 spines and 23-25 soft rays. The fourth dorsal spine is greatly elongated.

Tail fin

Caudal fin truncate to slightly emarginate.

Pectoral fin

Pectoral fins are relatively small and clear to yellowish.

Distinctive fins

The elongated fourth dorsal spine is a key characteristic of the genus Heniochus, particularly prominent in this species.

Identification Tips

1. 1

   Forehead Protuberance (Horn)

   Look for the distinct bony bump or 'horn' on the forehead, especially noticeable in adult specimens. This feature is less pronounced in juveniles.

2. 2

   Coloration and Banding

   Observe the two broad, diagonal black bands on a white body. The first band covers the eye, and the second runs across the mid-body. Yellow coloration on the soft dorsal, caudal, and anal fins is also characteristic.

3. 3

   Elongated Dorsal Fin Spine

   Note the greatly elongated fourth dorsal fin spine, which gives the fish its 'bannerfish' appearance.

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