HomeFish encyclopediaRay-finned fishesHalosaurs and deep-sea Spiny eelsDeep-sea spiny eelsSpiny-back eel Spiny-back eel (Notacanthus sexspinis) Scientific name: Notacanthus sexspinis Richardson, 1846 The Spiny-back eel (Notacanthus sexspinis) is a marine fish of the family Notacanthidae. BiologyDorsal spines: 5 - 9; Dorsal soft rays: 0-1; Anal spines: 10 - 18; Anal soft rays: 115 - 160. Pelvic fins with 1-3 spines, the first of which is rudimentary. Body dark brown, with darker fins and mouth.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameNotacanthus sexspinisFamilyNotacanthidae (Deep-sea spiny eels)OrderNotacanthiformes (Halosaurs and deep-sea Spiny eels)ClassActinopterygii (Ray-finned fishes)Maximum length60.0Depth range360–1300 m (1181–4265 ft)EnvironmentMarine; bathydemersal; depth range 360 - 1300 mClimateDeep-waterDistributionSoutheast Atlantic: Walvis Bay to Durban, South Africa. Southwest Atlantic: Brazil. Southeast Pacific: Chile. Eastern Indian Ocean: southern Australia, from Western Australia to New South Wales and Tasmania. Southwest Pacific: New Zealand.Conservation status (IUCN)Not EvaluatedThreat to humansHarmless SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026