HomeFish encyclopediaRay-finned fishesSmeltsBarreleyes or spookfishesGlasshead barreleye Glasshead barreleye (Rhynchohyalus natalensis) Scientific name: Rhynchohyalus natalensis Gilchrist & von Bonde, 1924 The Glasshead barreleye (Rhynchohyalus natalensis) is a marine fish of the family Opisthoproctidae. BiologyDorsal spines (total): 0; Dorsal soft rays (total): 10-12; Anal spines: 0; Anal soft rays: 7 - 10. Scattered melanophores ventrally; pelvic fins and area around anus black; head translucent. Body compressed. Brown in preserved specimen, with black pigment cells scattered in lower half.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameRhynchohyalus natalensisFamilyOpisthoproctidae (Barreleyes or spookfishes)OrderOsmeriformes (Smelts)ClassActinopterygii (Ray-finned fishes)Maximum length16.0Depth range247–549 m (810–1801 ft)EnvironmentMarine; pelagic-oceanic; depth range 247 - 549 mClimateTropicalDistributionEastern Atlantic: Madeira and off Cape Town, South Africa. Western Atlantic: in tropical waters. Western Pacific: off the Ogasawara Islands, Australia, and New Zealand. Reported from the Hawaiian Islands.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceMedium, minimum population doubling time 1.4 - 4.4 years (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