Cochu's blue tetra
Boehlkea fredcochui
Also known as Blue tetra
Care at a glance
- Temperature
- 72–82°F (22–28°C)
- pH
- 6.0–7.5
- Adult size
- 2.2 in (5.5 cm)
- Minimum tank
- 20 gal (75 L)
- Temperament
- Peaceful
- Social behavior
- Schooling
- Swim level
- Middle
- Difficulty
- Easy
- Breeding
- Hard
- Rarity
- Common
- Origin
- Peru
- Family
- Characidae
Overview
Keep a group of at least six, more if you have room, since this is a schooling fish that turns into a fin-nipper when kept in small numbers. It swims in the middle of the tank and is otherwise peaceful with similar-sized fish. A 75 liter tank suits a proper school. Feed quality flake and micro-pellets along with frozen brine shrimp and daphnia. Keep pH from 6 to 7.5 and the water warm and clean.
In the wild
Boehlkea fredcochui comes from the Amazon region of Peru, living in warm, slow stretches of river and side channels. The water is soft and runs from acidic to neutral. A planted tank with some open swimming space and gentle flow matches what it knows. Keep it warm, anywhere from the low 20s to the high 20s C.
Good to know
This is a small characin in the family Characidae, reaching around 5 to 6 cm. It's an egg scatterer with no parental care, and breeding it at home is difficult. The steel-blue body color is its defining trait and is strongest on healthy, settled fish.
Did you know
The species name honors Fred Cochu, an aquarium fish importer from the mid 1900s. He was one of the figures who helped build the early ornamental fish trade out of South America.
Where to buy
Some links may not be the exact species or variety.
- Aquatic Arts Freshwater fish, shrimp and snails with an arrive-alive guarantee
- Flip Aquatics Quarantined shrimp, snails and nano fish
- LiveAquaria Freshwater and saltwater fish, inverts and corals
…or ask your local fish store.
Appears in
Freshwater fish · Tetras · Beginner fish · Schooling fish · Community fish
Keeping Cochu's blue tetra?
Track water tests, reminders and stocking fit.
Related species

Golden Tetra
Hemigrammus rodwayi2.2 in (5.5 cm)20 gal (75 L)75–82°F (24–28°C)
Lesser bleeding heart tetra
Hyphessobrycon socolofi2.2 in (5.6 cm)24 gal (90 L)73–82°F (23–28°C)
Bleeding heart tetra
Hyphessobrycon erythrostigma2.4 in (6 cm)20 gal (75 L)70–81°F (21–27°C)
Glass bloodfin tetra
Prionobrama filigera2.4 in (6 cm)20 gal (75 L)73–81°F (23–27°C)
Red flush tetra
Hemigrammus stictus2.4 in (6 cm)20 gal (75 L)73–81°F (23–27°C)
Ceros Tetra
Moenkhausia ceros2 in (5 cm)16 gal (60 L)75–82°F (24–28°C)
