HomeFish encyclopediaRay-finned fishesLightfishes and DragonfishesBarbeled dragonfishesTwinthread dragonfish Twinthread dragonfish (Eustomias bifilis) Scientific name: Eustomias bifilis Gibbs, 1960 The Twinthread dragonfish (Eustomias bifilis) is a marine fish of the family Stomiidae. Native range: Indo-West Pacific, Papua New Guinea and Indonesia. Reported from the Hawaiian Islands. BiologyMesopelagic species. Minimum depth from. Also.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameEustomias bifilisFamilyStomiidae (Barbeled dragonfishes)OrderStomiiformes (Lightfishes and Dragonfishes)ClassActinopterygii (Ray-finned fishes)Depth range0–800 m (0–2625 ft)EnvironmentMarine; bathypelagic; depth range 0 - 800 mClimateDeep-waterDistributionIndo-West Pacific: Papua New Guinea and Indonesia. Reported from the Hawaiian Islands.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026