Cochu’s Blue Tetra

The Cochu’s Blue Tetra, scientifically known as Boehlkea fredcochui, is a striking and energetic species of freshwater tetra native to the upper Amazon Basin in Peru. This small characin is known for its vivid metallic blue coloration, which sets it apart from most other tetras and makes it a popular choice for hobbyists seeking an active and colorful schooling fish.

Adults typically reach about 1.2 to 1.5 inches (3 to 4 cm) in length. Their slender, torpedo-shaped bodies shimmer with a bright electric blue sheen under aquarium lighting, with translucent fins and occasional darker markings along the body. Males may display slightly more intense coloration and slimmer bodies compared to females, especially when in peak condition.

In the aquarium, Cochu’s Blue Tetras thrive in schools of six or more, as their bold color and confident behavior are most evident when kept in groups. A minimum tank size of 15 to 20 gallons is recommended, with plenty of open swimming space and scattered cover from plants or driftwood. Though they are highly adaptable, they do best in soft, slightly acidic to neutral water with moderate flow and good filtration.

Ideal water parameters include a temperature range of 74 to 82°F (23 to 28°C), pH between 6.0 and 7.5, and soft to moderately hard water. Stable water quality is important for maintaining their vivid coloration and active behavior.

Cochu’s Blue Tetras are omnivores and should be fed a varied diet to maintain their health and color. They eagerly accept high-quality flakes or micro pellets, as well as small frozen or live foods such as brine shrimp, daphnia, and bloodworms.

Though peaceful toward other species, they can be a bit nippy toward tankmates with long or flowing fins, especially if not kept in sufficient numbers. Ideal tankmates include other quick-moving tetras, rasboras, Corydoras, small barbs, and dwarf cichlids. Avoid pairing them with slow, delicate fish like fancy guppies or bettas.

Breeding in captivity is possible but not common. Like most small tetras, they are egg scatterers and do not exhibit parental care. A separate breeding tank with soft, slightly acidic water and fine-leaved plants or spawning mops is recommended. After spawning, adults should be removed to prevent egg predation.

Overall, Boehlkea fredcochui (Cochu’s Blue Tetra) is a dazzling, energetic addition to any peaceful community tank. Its brilliant coloration, constant activity, and shoaling behavior make it a favorite for those looking to add vibrant life to the mid-water column.