How to Identify Scribbled Rabbitfish

To identify Scribbled Rabbitfish (Siganus scriptus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

The base color is typically a mottled greenish-brown to yellowish-brown, covered with numerous small, irregular white to pale blue spots and scribbled lines that form a reticulated pattern. This pattern can change rapidly, becoming more pronounced or subdued depending on the fish's stress level or activity. A dark blotch may be present below the soft-rayed portion of the dorsal fin. The fins are generally yellowish or dusky.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Small, rabbit-like mouth with incisor-like teeth, Venomous spines in dorsal, anal, and pelvic fins, Distinctive scribbled pattern of white/pale blue spots and lines, Laterally compressed body

Dorsal fin

13 spines, 10 soft rays (XIII, 10). The spines are venomous.

Tail fin

Slightly emarginate to truncate.

Pectoral fin

16-17 rays. Transparent to yellowish.

Distinctive fins

Pelvic fins have 1 spine and 3 soft rays, followed by another spine (I, 3, I). All fin spines are venomous.

Identification Tips

1. 1

   Body Pattern

   Look for the characteristic 'scribbled' pattern of irregular white to pale blue spots and lines over a mottled greenish-brown to yellowish-brown body. This pattern is key to its identification.

2. 2

   Fin Spines

   Observe the fin structure: 13 dorsal spines, 7 anal spines, and pelvic fins with a spine-ray-spine configuration (I,3,I). All spines are venomous.

3. 3

   Mouth Shape

   Note the small, rabbit-like mouth with small, incisor-like teeth, adapted for grazing on algae.

4. 4

   Size

   Adults typically reach a maximum length of about 25-30 cm (10-12 inches), though some individuals may grow larger.

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