HomeMarine aquarium fishAngelfish & butterflyfishSaint Helena butterflyfish Saint Helena butterflyfish (Chaetodon sanctaehelenae) Scientific name: Chaetodon sanctaehelenae G?nther, 1868 The Saint Helena butterflyfish (Chaetodon sanctaehelenae) is a marine fish of the family Chaetodontidae. Native range: Southeast Atlantic, known only from the Ascension and St. Helena Islands. BiologyDorsal spines (total): 13; Dorsal soft rays (total): 21-23; Anal spines: 3; Anal soft rays: 19Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameChaetodon sanctaehelenaeFamilyChaetodontidae (Butterflyfishes)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length18.0Depth range0–25 m (0–82 ft)EnvironmentMarine; reef-associated; depth range 0 - 25 m, usually 0 - 15 mClimateTropicalDistributionSoutheast Atlantic: known only from the Ascension and St. Helena 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 nematopteraBlack-spotted butterflyfishChaetodon nigropunctatusTahiti butterflyfishChaetodon trichrousGardner's butterflyfishChaetodon gardineriEaster Island butterflyfishChaetodon litusArabian butterflyfishChaetodon melapterusSee 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