Orangespotted Filefish

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Oxymonacanthus longirostris - (Bloch & Schneider, 1801)
Orangespotted Filefish

A gloriously pigmented fish that seldom feeds in aquaria, needing live coral polyps on which to graze. Scott W. Michael


This is a stunning fish but one that is best avoided because of its specialized diet–it feeds only on small-polyped stony corals. Even those that accept alternate foods usually live a very abbreviated life.

Family: Monacanthidae

Other common name(s):

  • Harlequin Filefish

Native range:

Habitat: Near or among thickets of Acropora spp. branching stony corals.

Maximum length: 12 cm (5 in)

Minimum aquarium size: 76 L (20 gal)

Water: Marine 24 °C (75 °F) - 28 °C (82 °F)

General swimming level: All levels.


Feeds exclusively on the live polyps of Acropora spp. corals during daylight hours.

Reference: 101 Best Saltwater Fishes
Image credit: SWM
Text credit: SWM