HomeFreshwater aquarium fishCatfish & plecosRoyal panaque Royal panaque (Panaque nigrolineatus) Scientific name: Panaque nigrolineatus Peters, 1877 The Royal panaque (Panaque nigrolineatus) is a freshwater fish of the family Loricariidae that grows to about 25 cm (9.8 in). It is difficult to keep and peaceful, suits community aquariums and needs water at 22–26°C (72–79°F) and a pH of 6.5–7.5. Native range: South America, Orinoco and southern middle and lower Amazon River tributaries. Royal panaque care at a glanceCare levelDifficultTemperamentPeacefulCommunity tankExcellentAdult size25 cm (9.8 in)Temperature22–26°C (72–79°F)pH6.5–7.5Hardness2–15 dGH (36–268 ppm)DietHerbivore BiologyAquarium keeping: feeds on plants and roots; minimum aquarium size 120 cm.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePanaque nigrolineatusFamilyLoricariidae (Armored catfishes)OrderSiluriformes (Catfish)ClassActinopterygii (Ray-finned fishes)Maximum length43.0EnvironmentFreshwater;; pH range: 6.5 - 7.5; dH range: 2 - 15 benthopelagicClimateTropicalDistributionSouth America: Orinoco and southern middle and lower Amazon River tributaries.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interest; aquarium: commercial More catfish & plecosBlue-eye panaquePanaque suttonorumLeopard plecoPterygoplichthys gibbicepsFlagtail catfishDianema urostriatumPorthole catfishDianema longibarbisXingu corydorasCorydoras xinguensisThreestripe corydorasCorydoras trilineatusSee 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