HomeFreshwater aquarium fishTetras & characinsRed piranha Red piranha (Pygocentrus nattereri) Scientific name: Pygocentrus nattereri Kner, 1858 The Red piranha (Pygocentrus nattereri) is a freshwater fish of the family Characidae that grows to about 30 cm (12 in). It is difficult to keep and aggressive, is best kept in a species tank and needs water at 24–29°C (75–84°F). Native range: South America, Amazon River basin, Paraguay-Paran? River basin, northeastern Brazilian coastal rivers and Essequibo River basin. Red piranha care at a glanceCare levelDifficultTemperamentAggressiveCommunity tankNot suitableAdult size30 cm (12 in)Temperature24–29°C (75–84°F)Hardness5–18 dGH (89–321 ppm)DietCarnivore. Accepts live foods. BiologyCommon in creeks and interconnected ponds in Matto Grosso, Brazil, where it influences distribution and feeding of other fish and in areas of high primary production in Rio Machado and Rio Negro. Adults feed mainly at dusk and dawn. Feeds on insects, worms and fish. Medium-sized to large individuals (15-24 cm length) forage mainly at dawn, late afternoon and night up to about 2200H, whereas smaller fish (8-11 cm) are active mainly during the day. Teeth replacement on alternating sides of jaw allows continuous feeding. Its powerful dentition can inflict serious bites. Has a highly evolved auditory capacity and a 'lurking', then 'dashing' behavior during daytime. Shows hierarchies within small schools. Available information on body composition of 'piranha caju' flesh is 8.2% fat, 15.0% protein anSource: FishBase, licensed CC BY-NC 4.0. Species factsScientific namePygocentrus nattereriFamilyCharacidae (Characins)OrderCharaciformes (Characins)ClassActinopterygii (Ray-finned fishes)Maximum length50.0EnvironmentFreshwater;; pH range: 5.5 - 7.5; dH range: ? - 20 pelagicClimateSubtropicalDistributionSouth America: Amazon River basin, Paraguay-Paran? River basin, northeastern Brazilian coastal rivers and Essequibo River basin. Reported from the Uruguay River, Brazil.Conservation status (IUCN)Not EvaluatedThreat to humansTraumatogenicUsesFisheries: minor commercial; aquarium: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (K=0.89; tm=1; Fec=4,000-5,000) More tetras & characinsJewel tetraHyphessobrycon equesBlack tetraGymnocorymbus ternetziHemigrammus bellottiiMoenkhausia collettiiIguanodectes spilurusHemigrammus ulreyiSee all tetras & characins 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