HomeFish encyclopediaRay-finned fishesCatfishSea catfishesDay's catfish Day's catfish (Nedystoma dayi) Scientific name: Nedystoma dayi Ramsay & Ogilby, 1886 The Day's catfish (Nedystoma dayi) is a freshwater fish of the family Ariidae. Native range: Asia and Oceania, central-southern New Guinea. BiologyDorsal spines (total): 1; Dorsal soft rays (total): 7; Anal spines: 0; Anal soft rays: 20 - 25Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameNedystoma dayiFamilyAriidae (Sea catfishes)OrderSiluriformes (Catfish)ClassActinopterygii (Ray-finned fishes)Maximum length20.0EnvironmentFreshwater; demersalClimateTropicalDistributionAsia and Oceania: central-southern New Guinea.Conservation status (IUCN)Not EvaluatedThreat to humansTraumatogenicResilienceMedium, 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