HomeMarine aquarium fishAngelfish & butterflyfishMelon butterflyfish Melon butterflyfish (Chaetodon trifasciatus) Scientific name: Chaetodon trifasciatus Park, 1797 The Melon butterflyfish (Chaetodon trifasciatus) is a marine fish of the family Chaetodontidae. BiologyOccur in coral-rich lagoons and semi-protected seaward reefs. Territorial and aggressive to other Chaetodon. Small juveniles secretive in corals. Swim in pairs. Feed exclusively on coral polyps, particularly of the Pocillopora type. Oviparous, monogamous. Form pairs during breeding.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameChaetodon trifasciatusFamilyChaetodontidae (Butterflyfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length15.0Common length12.0Depth range2–20 m (7–66 ft)EnvironmentMarine; reef-associated; depth range 2 - 20 mClimateTropicalDistributionIndo-Pacific: East Africa to the Hawaiian and Tuamoto islands. However, the Pacific population has been recognized as a distinct subspecies (Chaetodon trifasciatus lunulatus Quoy & Gaimard, 1825) by Burgess while according to Randall, pers. comm. 1995, Chaetodon trifasciatus occurs only in the Indian Ocean, while Chaetodon lunulatus occurs only in the Pacific.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesFisheries: minor commercial; aquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (K>1) More angelfish & butterflyfishPajama cardinalfishSphaeramia nematopteraChevron butterflyfishChaetodon trifascialisPacific double-saddle butterflyfishChaetodon ulietensisHawaiian butterflyfishChaetodon tinkeriTeardrop butterflyfishChaetodon unimaculatusMirror butterflyfishChaetodon speculumSee all angelfish & butterflyfish SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026