How to Identify Spotted Trunkfish

To identify Spotted Trunkfish (Lactophrys triqueter), look at these key features.

Physical Characteristics

Body shape

rounded

Coloration

Adults typically have a dark brown to black body covered in numerous small, bright white or yellowish spots. The snout and mouth area are often yellowish. Juveniles are generally more yellowish with fewer, larger black spots. The caudal fin is usually yellow.

Scale type

none

Mouth position

terminal

Distinctive features

Rigid, box-like body encased in fused bony plates (carapace), Small, puckered mouth, Absence of pelvic fins, Small, fan-like dorsal and anal fins, Bright white or yellowish spots on a dark background (adults), Yellow caudal fin

Dorsal fin

Single, small, soft-rayed dorsal fin located posteriorly on the carapace.

Tail fin

Fan-shaped, typically yellow, used for propulsion.

Pectoral fin

Small, rounded, located laterally behind the gill openings, used for steering and maneuvering.

Distinctive fins

Pelvic fins are absent. The fins are relatively small compared to the body size, reflecting their unique swimming style.

Identification Tips

1. 1

   Body Shape

   Look for the characteristic rigid, box-like body, which is unmistakable among reef fish.

2. 2

   Coloration and Pattern

   Adults have a dark body with numerous small, bright white or yellowish spots. The snout and mouth are often yellow. Juveniles are more yellowish with larger black spots.

3. 3

   Caudal Fin

   The tail fin is typically bright yellow, which contrasts with the spotted body.

4. 4

   Mouth

   Observe the small, puckered mouth, which is adapted for picking small invertebrates from surfaces.

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