HomeFreshwater aquarium fishCatfish & plecosFlagtail catfish Flagtail catfish (Dianema urostriatum) Scientific name: Dianema urostriatum Miranda Ribeiro, 1912 The Flagtail catfish (Dianema urostriatum) is a freshwater fish of the family Callichthyidae that grows to about 8.5 cm (3.3 in). It is difficult to keep and peaceful, suits community aquariums and needs a tank of at least 75 L (20 US gal), water at 24–28°C (75–82°F) and a pH of 6.0–8.0. Native range: South America, Widespread in the Amazon basin. Flagtail catfish care at a glanceCare levelDifficultTemperamentPeacefulCommunity tankGoodAdult size8.5 cm (3.3 in)Minimum tank75 L (20 US gal)Temperature24–28°C (75–82°F)pH6.0–8.0DietOmnivore. Accepts flakes, frozen foods and live foods. Species factsScientific nameDianema urostriatumFamilyCallichthyidae (Callichthyid armored catfishes)OrderSiluriformes (Catfish)ClassActinopterygii (Ray-finned fishes)Maximum length8.4EnvironmentFreshwater;; pH range: 6.0 - 8.0; dH range: 5 - 19 demersalClimateTropicalDistributionSouth America: Amazon River basin.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interest; aquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) More catfish & plecosPorthole catfishDianema longibarbisXingu corydorasCorydoras xinguensisThreestripe corydorasCorydoras trilineatusRust corydorasCorydoras rabautiRoyal panaquePanaque nigrolineatusPygmy corydorasCorydoras pygmaeusSee all catfish & plecos SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0. Aquarium care parameters compiled, checked and converted to metric and imperial units by Guppies.za.net.Last updated 28 September 2026