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Moenkhausia rubra

Moenkhausia rubra is a small Amazonian characid valued for its warm coloration and lively schooling behavior. Native to the Rio Tapajós in Brazil, this species is less commonly offered than several familiar tetras, making it especially interesting to aquarists who enjoy uncommon fish. Peaceful, active, and suitable for a properly planned community aquarium, it should be kept in a group. Its best presentation comes from stable water, moderate lighting, and a layout that combines open swimming space with planted cover. This is a wild-collected species and is also exclusive to Ton.Fish in Canada.

General species description

Moenkhausia rubra is a small schooling fish in the family Characidae. It is associated with the Rio Tapajós basin and is best kept in a group of at least eight individuals to encourage natural behavior and reduce skittishness. Most activity takes place in the middle levels of the aquarium. Like many small Amazonian tetras, it benefits from clean, well-oxygenated water and consistent maintenance. Its commercial availability is moderate: it is less frequently offered than the most popular tetra species, but it is not an inaccessible rarity. A planted, peaceful, mature aquarium is preferable to a bare tank or one with excessive flow.

Geographic origin and biotope

The species comes from Brazil, in the basin of the Rio Tapajós. This region includes generally clear to lightly tinted water, sandy bottoms with plant debris, and river margins where vegetation provides shade and shelter. In the aquarium, this setting can be represented with fine sand, roots, leaf litter, and plants arranged around an open swimming area. A light to moderate current is more suitable for this small characid than strong, turbulent flow. Stable water quality and regular maintenance are more important than extreme blackwater conditions.

Precise location and local name

The main geographic reference is the Rio Tapajós in Pará State, Brazil. The clearest aquarium trade name is Tapajós red tetra, a descriptive name referring to both its origin and coloration. Moenkhausia rubra is still most often sold under its scientific name. Maintaining accurate origin records is useful when preserving the quality of a strain, especially with wild-collected fish. Because these specimens come from the wild, quarantine and careful acclimation are important after arrival.

Appearance and physical characteristics

Moenkhausia rubra has the streamlined, laterally compressed body typical of small tetras, with quick and agile swimming movements. Its most distinctive feature is its red to copper coloration, which usually shows best when the fish is well fed and kept over a dark background. The fins are relatively delicate and may show reddish or translucent tones. Color intensity varies with age, sex, mood, and lighting. Dark substrate, plants, and subdued lighting enhance its natural appearance without the need for artificial treatments.

General diet

As an omnivore with an insect-oriented diet, Moenkhausia rubra accepts a varied menu of quality micro-pellets, finely crumbled flakes, and small frozen foods. Baby brine shrimp, daphnia, and mosquito larvae can be offered as occasional supplements in small portions. Feed once or twice daily, giving only what the fish can consume quickly. A varied diet supports vitality and strong coloration, while overfeeding should be avoided to protect water quality. Young fish benefit from smaller, more frequent meals.

Essential data

• Native river: Rio Tapajós
• Local name used: Tapajós red tetra
• Origin of the scientific name: Moenkhausia is the genus name; rubra means red in Latin.
• Full-name etymology: Moenkhausia honors William J. Moenkhaus; rubra refers to the reddish coloration.
• Common or vernacular names: Tapajós red tetra; Red Moenkhausia
• Family: Characidae
• Subfamily: Stethaprioninae
• Name pronunciation: moenk-HOW-see-ah - ROO-brah
• Discovery: described by Pastana, Dagosta, and Marinho in 2014
• Maximum adult size: about 4 cm
• Water temperature and pH: 24 to 28 °C; pH 5.5 to 7.0
• Stream appearance and surrounding vegetation: clear to lightly tinted water, shaded margins, roots, leaf litter, and riparian vegetation.
• Typical tankmates: Hyphessobrycon bentosi, Hemigrammus rhodostomus, Corydoras agassizi, Otocinclus vestitus
• Temperament and behavior: peaceful, schooling, and active in the middle levels; keep in a group.
• Water depth: shallow to medium depth in calm areas and along margins.
• Sexual dimorphism: females are usually fuller-bodied; young fish can be difficult to sex.
• Bottom structure and flow: fine sand, plant debris, and roots; light to moderate current.
• Availability: wild-collected species and exclusive to Ton.Fish in Canada.

For greater success

To keep Moenkhausia rubra successfully, provide a mature, covered, well-maintained aquarium with adequate swimming length. Keep it in a group in soft to slightly acidic water, with efficient filtration and a moderate current. Dark substrate, plants, and roots will help display its red coloration while giving the fish security. Quarantine is especially important for wild-collected specimens. Offer varied food in small portions and choose peaceful tankmates of comparable size.