HomeMarine aquarium fishAngelfish & butterflyfishBicolor butterflyfish Bicolor butterflyfish (Prognathodes dichrous) Scientific name: Prognathodes dichrous G?nther, 1869 The Bicolor butterflyfish (Prognathodes dichrous) is a marine fish of the family Chaetodontidae. Native range: Southeast Atlantic, Saint Helena and Ascension islands. BiologyDorsal spines (total): 12; Dorsal soft rays (total): 19; Anal spines: 3; Anal soft rays: 15Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePrognathodes dichrousFamilyChaetodontidae (Butterflyfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length16.0Depth range3–120 m (10–394 ft)EnvironmentMarine; reef-associated; depth range 3 - 120 m, usually 15 - 35 mClimateTropicalDistributionSoutheast Atlantic: Saint Helena and Ascension islands.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesAquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) More angelfish & butterflyfishPajama cardinalfishSphaeramia nematopteraMarquesas butterflyfishChaetodon declivisDiagonal butterflyfishChaetodon fasciatusHooded butterflyfishChaetodon larvatusEritrean butterflyfishChaetodon paucifasciatusBluecheek butterflyfishChaetodon semilarvatusSee 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