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The Diamond Tetra, now called Makunaima pittieri, is a small Venezuelan characid valued for its metallic sheen and peaceful behavior. Native to the Lake Valencia basin, it inhabits calm to moderately flowing water, often along vegetated margins. Its silvery body becomes especially bright under subdued lighting, while males generally develop longer fins. Gregarious by nature, it should be kept in a group in a mature, well-filtered and partly planted aquarium. It is relatively easy to maintain, but stable water quality, a varied diet and adequate swimming space remain essential for preserving its coloration and natural behavior. Its limited natural range adds interest, although it remains reasonably available in the aquarium hobby.

General species description

Makunaima pittieri is a small schooling fish in the family Characidae, commonly known in the aquarium trade as the Diamond Tetra. It mainly uses the middle levels of the aquarium and should ideally be kept in a group of at least six individuals. Its behavior is generally peaceful and active, with little tendency to harass other fish when sufficient space is provided. The species is considered fairly common in the aquarium trade, although availability varies with shipments. It suits a peaceful freshwater community aquarium, provided it is not housed with very large, aggressive or predatory tank mates. Efficient filtration, regular water changes and subdued lighting support its well-being and highlight its reflective scales.

Geographic origin and biotope

Country of reference: Venezuela. Makunaima pittieri is associated with the endorheic Lake Valencia basin in the north-central part of the country. It has been reported from tributaries and peripheral areas of the basin, particularly around the Río Guacara area. The habitat includes generally calm to moderately flowing freshwater, with banks offering plant cover and filtered light. In an aquarium, this setting can be suggested with hardy plants, roots, shaded areas and gentle water movement, without creating excessive current. Stable, well-oxygenated water is more important than reproducing every visual detail of the natural habitat.

Precise locality and local name

The known range of Makunaima pittieri lies in the Lake Valencia basin, mainly in Carabobo State and nearby areas of north-central Venezuela. The Río Guacara is one of the geographic landmarks regularly associated with this species. No single Venezuelan vernacular name is widely established in common aquarium literature; locally, the fish may be described simply as a diamond tetra. In the trade, the English name Diamond Tetra is used much more often. This relatively restricted distribution contributes to the species’ interest, even though it remains accessible to aquarists.

Appearance and physical characteristics

The body of Makunaima pittieri is laterally compressed, fairly deep and covered with reflective scales. Its background coloration ranges from silvery to bluish gray, with golden-green or blue reflections that vary with lighting and mood. The scales create the characteristic sparkling appearance behind the name Diamond Tetra. The fins may show yellowish, orange or gray tones, particularly in mature males. Males are generally more slender and develop longer fins, while females are often fuller-bodied, especially when carrying eggs. Adult size remains modest, but the species still needs an aquarium with enough length to display its natural schooling movements.

General diet

In nature, Makunaima pittieri feeds on small aquatic prey, insects, larvae and various particles of plant origin. In aquaria, it readily accepts quality dry foods, but its condition and coloration benefit from a varied diet. Offer a base of small suitable pellets or flakes, supplemented several times per week with small frozen or live foods such as brine shrimp and mosquito larvae. Portions should be eaten quickly to protect water quality. An overly rich or monotonous diet can encourage excessive weight and reduce vitality. Small meals once or twice daily are generally appropriate for healthy adults.

Essential data

• Name of original river: Río Guacara, in the Lake Valencia basin
• Local name used: Tetra diamante
• Origin of the scientific name: Makunaima is the generic name; pittieri honors Henri François Pittier
• Etymology of the full name: Makunaima refers to Makunaima, a cultural figure among Indigenous peoples of the Guianas; pittieri commemorates naturalist Henri François Pittier
• Common/vernacular names: Diamond Tetra, tetra diamante
• Family: Characidae
• Subfamily: Not specified
• Name pronunciation: ma-koo-nye-ma pit-tee-air-ee
• Discovery: Described by Carl H. Eigenmann in 1920
• Maximum adult size: About 6 cm
• Water temperature and pH: 22 to 28 °C; pH 6.0 to 7.5
• Stream appearance and surrounding vegetation: Calm to moderately flowing freshwater, with vegetated banks and shaded areas
• Typical tank mates: Peaceful small characids, non-aggressive small cichlids, dwarf catfish and other community species of comparable size
• Temperament and behavior: Peaceful, schooling and active; keep in a group
• Water depth: Shallow to moderately deep areas near the banks
• Sexual dimorphism: Males are often more slender with better-developed fins; females are generally fuller-bodied
• Bottom structure and flow: Sandy or muddy areas, plant debris and low to moderate current

In your aquarium

For success with Makunaima pittieri, use a mature aquarium with open swimming space, plants and subdued lighting. Keep it in a group, monitor stable pH and temperature, and vary the diet with small frozen foods. Calm companions of comparable size will help preserve its schooling behavior and metallic coloration.