HomeFreshwater aquarium fishTetras & characinsMourning tetra Mourning tetra (Brycon pesu) Scientific name: Brycon pesu M?ller & Troschel, 1845 The Mourning tetra (Brycon pesu) is a freshwater fish of the family Characidae. Native range: South America, Amazon River basin; rivers in Guyana, Suriname, and French Guiana; Orinoco River basin. BiologyIs a gregarious species. Occurs over sand and rocks, in swift flowing waters where it swims rapidly and incessantly. Feeds on both plants and animals.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameBrycon pesuFamilyCharacidae (Characins)OrderCharaciformes (Characins)ClassActinopterygii (Ray-finned fishes)Maximum length12.0EnvironmentFreshwater; benthopelagicClimateTropicalDistributionSouth America: Amazon River basin; rivers in Guyana, Suriname, and French Guiana; Orinoco River basin.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) More tetras & characinsRummy-nose tetraHemigrammus rhodostomusEmber tetraHyphessobrycon amandaeOrnate tetraHyphessobrycon bentosiYellow tetraHyphessobrycon bifasciatusRosy tetraHyphessobrycon rosaceusRoyal tetraInpaichthys kerriSee all tetras & characins SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026