HomeFish encyclopediaRay-finned fishesCusk eelsCusk-eelsOnespot cusk Onespot cusk (Neobythites unimaculatus) Scientific name: Neobythites unimaculatus Smith & Radcliffe, 1913 The Onespot cusk (Neobythites unimaculatus) is a marine fish of the family Ophidiidae. Native range: Western Pacific, Japan to the Philippines, off New Caledonia and the Arafura Sea. BiologyDorsal soft rays (total): 90-92; Anal soft rays: 74 - 75; Vertebrae: 53 - 54. Distinct ocellus on dorsal fin situated immediately behind vertical line through anus, two sharp spines on posterior margin of preoperculum, ventral fins reaching halfway to anus and no vertical bars on body.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameNeobythites unimaculatusFamilyOphidiidae (Cusk-eels)OrderOphidiiformes (Cusk eels)ClassActinopterygii (Ray-finned fishes)Maximum length14.9Depth range110–565 m (361–1854 ft)EnvironmentMarine; benthopelagic; depth range 110 - 565 mClimateDeep-waterDistributionWestern Pacific: Japan to the Philippines, off New Caledonia and the Arafura Sea.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