HomeFish encyclopediaRay-finned fishesLightfishes and DragonfishesBarbeled dragonfishesHiddenbulb dragonfish Hiddenbulb dragonfish (Eustomias cryptobulbus) Scientific name: Eustomias cryptobulbus Clarke, 2001 The Hiddenbulb dragonfish (Eustomias cryptobulbus) is a marine fish of the family Stomiidae. Native range: Indo-Pacific, known from two stations in the Indian Ocean and from many areas throughout the Pacific. Also known from four stations in the southeast Atlantic. BiologyBarbel with three slender, unpigmented branches arising together from stem; all three reaching to or well beyond barbel tip; barbel stem pigmented externally up to origin of branches; only axis of distal part of stem pigmented except for an elongate, often distally forked, patch of external pigment extending dorsally from distal section of stem almost to distal tip of terminal bulb; bulb elongate, its length well over two times in its thickness; medial and lateral terminal filaments arising from unpigmented bulb tip.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameEustomias cryptobulbusFamilyStomiidae (Barbeled dragonfishes)OrderStomiiformes (Lightfishes and Dragonfishes)ClassActinopterygii (Ray-finned fishes)Maximum length13.9Depth range0–975 m (0–3199 ft)EnvironmentMarine; bathypelagic; depth range 0 - 975 mClimateDeep-waterDistributionIndo-Pacific: known from two stations in the Indian Ocean and from many areas throughout the Pacific. Also known from four stations in the southeast Atlantic.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Assuming tmax>3) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026