How to Identify Copperband Butterflyfish

To identify Copperband Butterflyfish (Chelmon rostratus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

The body is predominantly white to silvery-white, adorned with four distinct, vertical, coppery-orange to reddish-brown bands. The first band passes through the eye, often with a black ocellus (eyespot) on the posterior dorsal fin, which serves as a false eye to deter predators. The snout is elongated and tubular, typically yellowish. The fins are often edged with yellow or orange.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Elongated, tubular snout (rostrum), Four prominent vertical copper-colored bands, Black ocellus (eyespot) on the posterior dorsal fin, Laterally compressed body

Dorsal fin

Single dorsal fin with 10-11 spines and 23-25 soft rays. The posterior part often bears a prominent black ocellus.

Tail fin

Caudal fin is truncate to slightly rounded.

Pectoral fin

Pectoral fins are relatively small and translucent.

Distinctive fins

Anal fin has 3 spines and 17-19 soft rays. Pelvic fins are small.

Identification Tips

1. 1

   Snout

   The most distinguishing feature is its long, slender, and tubular snout, which it uses to probe crevices and substrate for food.

2. 2

   Banding

   Four prominent, vertical, coppery-orange bands across a white body are unmistakable.

3. 3

   Eyespot

   A black ocellus (eyespot) on the posterior part of the dorsal fin is a key identifier, mimicking an eye to confuse predators.

4. 4

   Body Shape

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

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