HomeFish encyclopediaRay-finned fishesCharacinsCharacinsBanded tetra Banded tetra (Astyanax aeneus) Scientific name: Astyanax aeneus G?nther, 1860 The Banded tetra (Astyanax aeneus) is a freshwater fish of the family Characidae. In the aquarium it needs water at 20–37°C (68–99°F). Banded tetra care at a glanceTemperature20–37°C (68–99°F) BiologyDiffers from A. nasutus and A. orthodus by its distinct humeral blotch and intermediate body depth. Sides and belly silvery over pearl white merging to a greenish brown back; in preserved specimens, a gray band runs from the humeral mark to the caudal peduncle which has a jet black rhomboidal mark extending to the tip of the middle caudal rays; transparent fins with minimal dark pigment; usually first rays of anal and sometimes dorsal and caudal fins with red or yellow pigment.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAstyanax aeneusFamilyCharacidae (Characins)OrderCharaciformes (Characins)ClassActinopterygii (Ray-finned fishes)Maximum length7.5EnvironmentFreshwater; brackish; benthopelagicClimateTropicalDistributionCentral America: lower Rio Papaloapan and Colima, Mexico south to some places in Central America, extending to the Rio Cocle del Norte and Rio Tabasara in Panama.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessResilienceHigh, 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