How to Identify White-spotted spinefoot

To identify White-spotted spinefoot (Siganus canaliculatus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

The body is generally greenish-brown to greyish-brown, often with a mottled or marbled pattern. The most distinctive feature is the presence of numerous small, pearly white or pale blue spots covering the head, body, and fins. These spots can sometimes be indistinct or absent depending on the fish's mood or environment. The belly is typically paler. During spawning or stress, coloration can intensify or darken.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Small, pearly white spots covering the body and head, Venomous spines in dorsal, anal, and pelvic fins, Small, rabbit-like mouth, Deeply forked caudal fin in adults

Dorsal fin

13 spines and 10 soft rays. The spines are venomous.

Tail fin

Deeply forked in adults, slightly emarginate in juveniles.

Pectoral fin

16-18 soft rays.

Distinctive fins

Pelvic fins have 2 spines and 3 soft rays (I,3,I formula), a unique characteristic of the Siganidae family. All fin spines are grooved and contain venom glands.

Identification Tips

1. 1

   Body Spots

   Look for numerous small, pearly white or pale blue spots scattered across the body and head. These are the most reliable distinguishing feature.

2. 2

   Fin Spines

   Observe the characteristic fin spine formula: 13 dorsal spines, 7 anal spines, and pelvic fins with an outer spine, three soft rays, and an inner spine (I,3,I). All spines are venomous.

3. 3

   Mouth Shape

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

4. 4

   Caudal Fin

   Adults typically have a deeply forked caudal fin, which can help differentiate them from some other rabbitfish species with more truncate or emarginate tails.

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