HomeFish encyclopediaRay-finned fishesCatfishEeltail catfishesSouthern tandan Southern tandan (Neosilurus equinus) Scientific name: Neosilurus equinus Weber, 1913 The Southern tandan (Neosilurus equinus) is a freshwater fish of the family Plotosidae. Native range: Asia and Oceania, central-southern New Guinea including the Upper Kikori (including Lake Kutubu), Fly-Strickland and Lorentz river systems. BiologyDorsal spines (total): 1; Dorsal soft rays (total): 6-7; Anal spines: 0; Anal soft rays: 75 - 93Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameNeosilurus equinusFamilyPlotosidae (Eeltail catfishes)OrderSiluriformes (Catfish)ClassActinopterygii (Ray-finned fishes)Maximum length37.5EnvironmentFreshwater; demersalClimateTropicalDistributionAsia and Oceania: central-southern New Guinea including the Upper Kikori (including Lake Kutubu), Fly-Strickland and Lorentz river systems.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