Threadfin Butterflyfish
Chaetodon auriga
Threadfin Butterflyfish (Chaetodon auriga) is a coral-reef butterflyfish of the Indo-Pacific, common on lagoon and outer-reef slopes. It feeds mainly on small benthic invertebrates and coral-associated prey, and is recognized by a black ocellus near the tail and a trailing dorsal filament.
Identification points
- White body with a broad black diagonal band through the eye
- Black ocellated spot near the base of the soft dorsal fin/tail area
- Long trailing filament from the rear of the dorsal fin, with yellow-orange rear body and fins
Habitat
Coral reefs, reef flats, lagoons, and sheltered outer-reef slopes; usually seen singly or in pairs around rich coral and rubble areas from very shallow water to moderate depths.
Bait notes
Not a standard sport fish. In aquaria it is typically fed small meaty marine foods such as mysis, finely chopped shrimp, and other frozen invertebrates; it rarely targets hook baits.
Behavior
Diurnal feeder that picks at coral surfaces and reef rock for worms, small crustaceans, and other tiny invertebrates; often cruises slowly and can be territorial around reef patches.
Caution
Reef-dependent species; local regulations may protect butterflyfishes in some areas, and release carefully if caught. Do not eat unless local guidance confirms it is a legal food fish, as small reef fish can pose ciguatera risk in some regions.
Fishing notes
Generally not targeted by anglers; if encountered on light reef tackle, it is more likely a bycatch around coral heads than a purposeful catch. Avoid fishing in coral to minimize habitat damage.