How to Identify Golden Butterflyfish

To identify Golden Butterflyfish (Chaetodon semilarvatus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

The body is predominantly a brilliant, uniform golden-yellow. A prominent, iridescent blue-black mask covers the eyes, extending slightly onto the snout and forehead. The dorsal, anal, and caudal fins are also yellow, often with a subtle orange tint at their margins. Juveniles may exhibit a small black ocellus (eyespot) on the posterior part of the dorsal fin, which fades with age.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Brilliant golden-yellow body coloration., Distinctive blue-black mask over the eyes., Elongated snout, typical of butterflyfishes, adapted for feeding on small invertebrates and coral polyps.

Dorsal fin

Typically XI-XIII spines, 22-25 soft rays. The spiny and soft-rayed portions are continuous.

Tail fin

Truncate to slightly emarginate, with 17 soft rays.

Pectoral fin

15-16 rays, relatively small and rounded.

Distinctive fins

Pelvic fins are small and yellow. Anal fin has III spines and 19-22 soft rays.

Identification Tips

1. 1

   Coloration

   The vibrant golden-yellow body with the contrasting blue-black eye mask is unmistakable. No other butterflyfish in its range shares this exact color pattern.

2. 2

   Body Shape

   Laterally compressed, disc-shaped body, typical of the genus Chaetodon.

3. 3

   Fin Structure

   Observe the continuous dorsal fin and the truncate caudal fin, all matching the body's yellow hue.

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