Fingerprint Filefish

The Fingerprint Filefish (Pervagor melanocephalus), also widely known as the redtail or blackheaded filefish, is a small reef-dwelling species in the filefish family Monacanthidae. It is distributed across the Indo-West Pacific, from the Andaman Sea and Southeast Asia to Japan, Australia, and the western Pacific islands. The species gets nicknames from its dark, near-black head contrasting with an orange-brown body marked by fine, irregular whorled lines reminiscent of a fingerprint pattern, and a vivid orange tail fin. It inhabits coral-rich reef areas and is a popular small aquarium species. It is common within its range and faces no significant conservation concerns.

• Small, oval, laterally compressed body, 10-16 cm
• Dark blackish head sharply contrasting with an orange-tan body
• Fine, irregular dark whorled lines across the flanks, resembling a fingerprint pattern
• Bright orange tail fin
• Small, pointed mouth and thin erectile first dorsal spine
• Rough, sandpaper-like skin texture typical of filefish
• Shy, retiring behavior near coral cover rather than swimming in open water

Distinguished from related Pervagor species by the sharply defined dark head and the fine whorled body markings rather than the solid or blotched coloring typical of its close relatives.

Fingerprint Filefish occur across the Indo-West Pacific, from the Andaman Sea and Indonesia through the Philippines and Southeast Asia to southern Japan, Australia, and various western Pacific island groups. They inhabit coral-rich reef slopes and lagoons, typically at depths of 3-30 m, favoring areas with mixed coral growth that provide both shelter and grazing surfaces. They are usually seen singly or in loose pairs near reef structure rather than in open water. Sheltered lagoon and fore-reef habitats with dense coral branches offer the cover this small, shy species relies on to avoid predators while grazing.

Fingerprint Filefish are generally shy and solitary or found in loose pairs, staying close to coral cover for shelter and retreating into crevices when approached or threatened. They graze during the day on algae, small invertebrates, and detritus from reef surfaces, using a small, precise mouth suited to picking food from tight spaces. Like other filefish, they swim with undulating movements of the dorsal and anal fins rather than relying heavily on the tail, giving a slow, hovering motion. They can erect a thin dorsal spine as a deterrent and wedge themselves into crevices when disturbed, a defense shared with related triggerfish.