HomeFish encyclopediaRay-finned fishesCharacinsCharacinsBlackline tetra Blackline tetra (Hyphessobrycon scholzei) Scientific name: Hyphessobrycon scholzei Ahl, 1937 The Blackline tetra (Hyphessobrycon scholzei) is a freshwater fish of the family Characidae. In the aquarium it needs water at 22–28°C (72–82°F). Native range: South America, Lower Amazon River basin. Blackline tetra care at a glanceTemperature22–28°C (72–82°F) BiologyFeeds on worms, small crustaceans and plant matter.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameHyphessobrycon scholzeiFamilyCharacidae (Characins)OrderCharaciformes (Characins)ClassActinopterygii (Ray-finned fishes)Maximum length4.0EnvironmentFreshwater;; pH range: 6.8 - 8.0; dH range: ? - 25 benthopelagicClimateTropicalDistributionSouth America: Lower Amazon River basin.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026