HomeFish encyclopediaRay-finned fishesEels and MoraysCutthroat eelsKaup's arrowtooth eel Kaup's arrowtooth eel (Synaphobranchus kaupii) Scientific name: Synaphobranchus kaupii Johnson, 1862 The Kaup's arrowtooth eel (Synaphobranchus kaupii) is a marine fish of the family Synaphobranchidae. BiologyDorsal soft rays (total): 270. Dark purplish grey in color. Anal rays about 270.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSynaphobranchus kaupiiFamilySynaphobranchidae (Cutthroat eels)OrderAnguilliformes (Eels and Morays)ClassActinopterygii (Ray-finned fishes)Maximum length100.0Depth range120–4800 m (394–15748 ft)EnvironmentMarine; bathydemersal; depth range 120 - 4800 m, usually 400 - 2200 mClimateDeep-waterDistributionEastern Atlantic: Faroes and Iceland to Cape Verde, Nigeria, Namibia, and South Africa. Western Atlantic: Greenland to Bahamas; also Brazil. Northwest Atlantic: Canada. Indo-West Pacific: Japan and Australia; Hawaii and the Indian Ocean.Conservation status (IUCN)Least Concern (LC)Threat to humansHarmlessUsesFisheries: of no interestResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Assuming fecundity > 100) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026