Longnose Filefish

Oxymonacanthus longirostris

Longnose Filefish is a small coral-reef fish specialized on Acropora corals, with a very long tubular snout and cryptic green-and-blue camouflage. It is mostly of interest to aquarists; it is not a typical angling target and is rarely taken on hook and line.

Saltwater

Longnose Filefish reference image — Rickard Zerpe, cc-by, via Wikimedia Commons. Source: Wikimedia Commons.

Identification points

Very long, narrow tubular snout
Leaflike, laterally compressed body with mottled green-and-blue camouflage
Small tail fin with a characteristic filefish silhouette and rough, angular profile

Habitat

Shallow tropical coral reefs, especially branching Acropora-dominated areas, lagoon reefs, and sheltered reef slopes where it can blend with coral branches.

Bait notes

Not a standard gamefish and usually not targeted with bait or lures. If encountered around reefs, tiny live coral-associated prey or very small zooplankton-type offerings are the only plausible attractants, but capture should be avoided.

Behavior

Diurnal and very reclusive; it picks tiny coral polyps and small invertebrates from Acropora branches, often moving slowly in pairs or singly and relying on camouflage rather than speed.

Caution

Collection and possession may be restricted locally because it is a specialized reef fish associated with living corals; avoid handling and never remove from the reef. As a tropical reef species, it is not a food fish.

Fishing notes

No practical recreational fishing method applies; it is best observed or photographed rather than pursued. On reefs, it is easily stressed and does not respond like a conventional sport species.