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The Blueberry Tetra, sold under the scientific name Hyphessobrycon wadai, is a small South American characin valued for its bluish to purplish coloration and schooling behavior. Native to Brazil, it comes from waterways associated with the rio Juruena basin in Mato Grosso. This species remains uncommon in the aquarium trade, making it an appealing choice for aquarists who enjoy less frequently seen tetras. The specimens offered here are wild-collected and are available exclusively from Ton.Fish in Canada.

General species description

Hyphessobrycon wadai is a small schooling fish belonging to the family Characidae. It becomes more confident when kept with several conspecifics. Its main attraction is its bluish coloration, sometimes enhanced by violet reflections depending on lighting, water quality and the fish’s condition. Like many small Amazonian tetras, it appreciates stable, clean and well-oxygenated water. A group of at least 8 to 10 individuals allows more natural behavior and reduces nervousness. Its generally peaceful temperament suits a community aquarium containing calm fish of comparable size.

Geographic origin and biotope

Country of reference: Brazil. Hyphessobrycon wadai is associated with the rio Juruena basin in Mato Grosso, a region of the southern Amazon. Its natural environment consists of small forest streams, with light filtered by riparian vegetation. The water is generally soft and slightly acidic to neutral, with tropical temperatures. To recreate this setting, use a planted aquarium with roots, some dried leaves and gentle to moderate water movement. Shaded areas also help the fish display its colors and remain active without being constantly exposed.

Precise location and local name

The known range is in the area of the rio Juruena in Mato Grosso, Brazil. The name Blueberry Tetra is mainly used in the international aquarium trade and refers to its blue-violet coloration. In French, the name tétra Blueberry may also be used. This is a fish with limited availability, particularly when referring to wild-collected specimens. Gradual acclimation is recommended because wild small characins may be sensitive to sudden changes in temperature, pH and conductivity. Floating plants or moderate lighting usually help them adjust.

Appearance and physical characteristics

The body of Hyphessobrycon wadai is short, slender and laterally compressed, with the typical shape of a small tetra. Its most distinctive feature is a blue to blue-violet coloration, especially visible on the flanks when the fish is in good condition. The fins are delicate and may show translucent or slightly colored tones. As with several related species, coloration varies with lighting, surroundings, age and stress. Its adult size remains modest, allowing it to be kept in a reasonably sized aquarium as long as its need for swimming space and a well-formed school is respected.

General feeding

Hyphessobrycon wadai is an omnivore with an insectivorous tendency. In aquariums, it generally accepts quality small dry foods, but its condition and coloration benefit from a varied diet. Offer fine flakes, micro-pellets, baby brine shrimp, daphnia and small frozen foods. Food particles should be small enough for a fish of this size to swallow easily. Feeding small amounts once or twice daily helps limit waste and pollution. Live or frozen foods are excellent supplements for stimulating feeding and supporting the vitality of the school.

Essential data

• River of origin: Rio Juruena
• Local name used: Blueberry Tetra
• Origin of the scientific name: Hyphessobrycon wadai is the taxonomic name assigned to the species.
• Etymology of the complete name: Hyphessobrycon is a genus name of Greek origin; wadai is the specific epithet.
• Common/vernacular names: Blueberry Tetra
• Family: Characidae
• Subfamily: Not included here.
• Name pronunciation: if ess oh BRY kon wah DIE
• Discovery: Recently described species; the author and year are not included here.
• Maximum adult size: Approximately 3 cm
• Water temperature and pH: 24 to 28 °C; pH 5.5 to 7.0
• Stream appearance and surrounding vegetation: Small shaded forest streams bordered by tropical vegetation, roots and leaf litter.
• Typical tankmates: Hyphessobrycon amandae, Hyphessobrycon bentosi, Hyphessobrycon cyanotaenia
• Temperament and behavior: Peaceful, schooling and mainly active in open water; keep in a group.
• Water depth: Shallow to intermediate areas of small streams.
• Sexual dimorphism: Mature females are generally fuller-bodied; males may be more slender.
• Bottom structure and flow: Sand, fine gravel, leaves and plant debris; low to moderate flow.

In your aquarium

To succeed with Hyphessobrycon wadai, provide soft, stable and well-maintained water, moderate lighting and a layout with sheltered areas. A sufficiently large school encourages natural behavior and better social interaction. Because these are wild-collected specimens, slow acclimation, varied foods and close observation during the first weeks are especially important. Its uncommon availability also calls for a responsible approach: avoid rushed introductions and prioritize consistent water quality over sudden parameter changes.