HomeFreshwater aquarium fishTetras & characinsCochu's blue tetra Cochu's blue tetra (Boehlkea fredcochui) Scientific name: Boehlkea fredcochui G?ry, 1966 The Cochu's blue tetra (Boehlkea fredcochui) is a freshwater fish of the family Characidae that grows to about 4 cm (1.6 in). It is easy to keep and peaceful, suits community aquariums and needs a tank of at least 115 L (30 US gal), water at 22–26°C (72–79°F) and a pH of 6.0–8.0. Native range: South America, Amazon River basin. Cochu's blue tetra care at a glanceCare levelEasyTemperamentPeacefulCommunity tankExcellentAdult size4 cm (1.6 in)Minimum tank115 L (30 US gal)Temperature22–26°C (72–79°F)pH6.0–8.0Hardness5–12 dGH (89–214 ppm)DietOmnivore. Accepts flakes, frozen foods and live foods. Species factsScientific nameBoehlkea fredcochuiFamilyCharacidae (Characins)OrderCharaciformes (Characins)ClassActinopterygii (Ray-finned fishes)Maximum length4.1EnvironmentFreshwater;; pH range: 6.0 - 8.0; dH range: 5 - 12 benthopelagicClimateTropicalDistributionSouth America: Amazon River basin.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) More tetras & characinsRedflank bloodfinAphyocharax rathbuniDarter characinCharacidium fasciatumRummy-nose tetraHemigrammus rhodostomusEmber tetraHyphessobrycon amandaeOrnate tetraHyphessobrycon bentosiYellow tetraHyphessobrycon bifasciatusSee 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