HomeFish encyclopediaRay-finned fishesSmeltsDeep-sea smeltsCalifornia smoothtongue California smoothtongue (Leuroglossus stilbius) Scientific name: Leuroglossus stilbius Gilbert, 1890 The California smoothtongue (Leuroglossus stilbius) is a marine fish of the family Bathylagidae. Native range: Eastern Pacific, Oregon, USA to Gulf of California. BiologyAbundant in midwater from near surface to 690 m. Oviparous, with planktonic eggs and larvae.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameLeuroglossus stilbiusFamilyBathylagidae (Deep-sea smelts)OrderOsmeriformes (Smelts)ClassActinopterygii (Ray-finned fishes)Maximum length15.0Depth range100–690 m (328–2264 ft)EnvironmentMarine; bathypelagic; depth range 100 - 690 mClimateDeep-waterDistributionEastern Pacific: Oregon, USA to Gulf of California.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