orange-lined triggerfish

The orange-lined triggerfish can reach up to 30 cm in length. Its trapezoidal and flattened body, covered with large scales, is adorned with a very distinctive coloration that makes it easy to identify.

Its coloration, usually greenish to brownish, is marked by diagonal orange lines that run across the entire body, except for the cheeks in adult individuals. The slightly rounded caudal fin is also tinted orange, and a large circular black spot covers the base of this fin.

Like other Triggerfish, it has a first dorsal fin made up of three spines. The first spine, long and sharp, can be locked in a vertical position, even after the fish's death. This feature serves to deter predators and also to anchor the fish in narrow cavities when resting, preventing it from being carried away by currents. The second dorsal fin is symmetrical to the anal fin, while the pelvic fins are reduced to a single spine.

Two dark lines are visible on the caudal peduncle, formed by spiny scales. Finally, its small mouth, armed with sharp teeth, allows it to break the shells of its prey.

The orange-lined triggerfish is a rather solitary fish that is rarely encountered in groups. Its diet is very varied: it consumes algae, fish, mollusks, tunicates, sponges, hydrozoans, and echinoderms. It is considered a key predator, particularly because it regulates populations of the burrowing sea urchin Echinometra mathaei. By limiting its proliferation, the orange-lined triggerfish actively contributes to maintaining the structure and health of reefs.

At night, they hide in crevices and cavities, where they wedge themselves by raising their dorsal fin.

The orange-lined triggerfish is an ovoviviparous fish. The male descends to the bottom, flexing its body laterally while beating its dorsal and caudal fins to dig a nest in the sand.

The eggs are laid in the nest, in a single spongy cluster. The male guards the eggs until hatching, and sometimes both adults do. Hatching occurs at night.