How to Identify Picasso Triggerfish

To identify Picasso Triggerfish (Rhinecanthus aculeatus), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

The body is predominantly light tan to yellowish-brown dorsally, fading to white ventrally. A prominent black band runs from the eye to the pectoral fin base, and another black band encircles the snout. Distinctive blue and yellow lines adorn the face, resembling abstract art. A black patch is present on the caudal peduncle, and the dorsal and anal fins have yellow margins. The caudal fin is typically yellowish with a black submarginal band.

Scale type

placoid

Mouth position

terminal

Distinctive features

First dorsal spine can be locked upright (trigger mechanism), Small, pig-like snout, Small, powerful mouth with strong teeth, Rough, leathery skin with small, non-overlapping scales

Dorsal fin

Two dorsal fins; the first consists of three strong spines, with the first spine being the longest and capable of being locked upright by the second spine. The second dorsal fin is soft-rayed (23-26 rays).

Tail fin

Truncate to slightly rounded caudal fin (11-12 rays).

Pectoral fin

Small, rounded pectoral fins (13-14 rays).

Distinctive fins

Anal fin is soft-rayed (21-23 rays) and mirrors the shape of the second dorsal fin. Pelvic fins are fused into a single, spiny flap.

Identification Tips

1. 1

   Coloration and Pattern

   Look for the distinctive black band from the eye to the pectoral fin, the black band around the snout, and the blue and yellow lines on the face. The black patch on the caudal peduncle is also a key identifier.

2. 2

   Body Shape

   Its compressed, oval body and small, upturned mouth are characteristic of triggerfish.

3. 3

   Trigger Mechanism

   Observe the first dorsal spine; if threatened, the fish will erect this spine and lock it in place with the second spine, making it difficult for predators to dislodge it from crevices.

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