How to Identify Masked Rabbitfish

To identify Masked Rabbitfish (Siganus puellus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Bright yellow body with numerous small, iridescent blue spots covering the head, body, and fins. A prominent dark brown to black band (mask) extends from the snout, through the eye, to the nape. The caudal fin is typically yellow, sometimes with a dusky margin. Juveniles often have a more muted yellow and less distinct spotting, with the mask being a key identifier.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Bright yellow body with blue spots, Dark mask-like band through the eye, Venomous fin spines, Small, rabbit-like mouth

Dorsal fin

13 spines, 10 soft rays. The dorsal spines are venomous.

Tail fin

Slightly emarginate to truncate, typically yellow.

Pectoral fin

16-18 rays, clear to yellowish.

Distinctive fins

Pelvic fins have 1 spine and 3 soft rays, flanked by another spine (I,3,I formula), which is characteristic of the Siganidae family. All fin spines are grooved and contain venom glands.

Identification Tips

1. 1

   Coloration

   Look for the bright yellow body with numerous small blue spots. This is a primary distinguishing feature.

2. 2

   Mask

   The dark brown/black band extending from the snout through the eye to the nape is a definitive characteristic for this species.

3. 3

   Fin Spines

   Observe the characteristic rabbitfish fin spine formula (13 dorsal spines, 7 anal spines, and pelvic fins with I,3,I spines). While not unique to S. puellus, it confirms it as a rabbitfish.

4. 4

   Body Shape

   The compressed, oval body shape is typical of rabbitfish.

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