HomeFreshwater aquarium fishCatfish & plecosPimelodus ornatus Pimelodus ornatus Scientific name: Pimelodus ornatus Kner, 1858 Pimelodus ornatus is a freshwater fish of the family Pimelodidae that grows to about 26 cm (10 in). It is easy to keep and aggressive and needs a tank of at least 210 L (55 US gal), water at 24–27°C (75–81°F) and a pH of 6.5–7.2. Native range: South America, Amazon, Corantijn, Essequibo, Orinoco, and Paran? River basins; also in major rivers of the Guianas. Pimelodus ornatus care at a glanceCare levelEasyTemperamentAggressiveAdult size26 cm (10 in)Minimum tank210 L (55 US gal)Temperature24–27°C (75–81°F)pH6.5–7.2Hardness5–18 dGH (89–321 ppm)DietCarnivore. Accepts flakes, pellets, frozen foods and live foods. BiologyOccurs in principal river beds, in upstream parts of rivers, downstream rapids, in backwater zones or on stony bottoms of pools with dead tree trunks. Active at dusk. Piscivorous. Emits loud grumblings. Secretes toxic mucus and the wounds caused by its pectoral spines are very painful. The female can preserve spermatozoids by coating them with original maternal secretions and inserting them in the epithelium of its genital tract. The presence of sperm in the mucus of the female's genital tract is indicative of internal fertilization.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePimelodus ornatusFamilyPimelodidae (Long-whiskered catfishes)OrderSiluriformes (Catfish)ClassActinopterygii (Ray-finned fishes)Maximum length38.5EnvironmentFreshwater;; pH range: 6.5 - 7.2; dH range: ? - 18 benthopelagicClimateTropicalDistributionSouth America: Amazon, Corantijn, Essequibo, Orinoco, and Paran? River basins; also in major rivers of the Guianas.Conservation status (IUCN)Not EvaluatedThreat to humansTraumatogenicUsesFisheries: commercial; aquarium: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.) More catfish & plecosMystus leucophasisHognosed brochisBrochis multiradiatusPictus catPimelodus pictusCorydoras agassiziiSiamese algae-eaterGyrinocheilus aymonieriLeopard plecoPterygoplichthys gibbicepsSee 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