HomeFish encyclopediaRay-finned fishesCharacinsSouth American dartersGreen dwarf tetra Green dwarf tetra (Odontocharacidium aphanes) Scientific name: Odontocharacidium aphanes Weitzman & Kanazawa, 1977 The Green dwarf tetra (Odontocharacidium aphanes) is a freshwater fish of the family Crenuchidae. In the aquarium it needs water at 24–28°C (75–82°F). Native range: South America, Amazon River basin. Green dwarf tetra care at a glanceTemperature24–28°C (75–82°F) Species factsScientific nameOdontocharacidium aphanesFamilyCrenuchidae (South American darters)OrderCharaciformes (Characins)ClassActinopterygii (Ray-finned fishes)Maximum length1.7EnvironmentFreshwater;; pH range: 5.8 - 7.0; dH range: ? - 12 pelagicClimateTropicalDistributionSouth America: Amazon River basin.Conservation status (IUCN)Not EvaluatedThreat to humansHarmless SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.Last updated 27 September 2026