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Hyphessobrycon weitzmanorum is a small Amazonian tetra valued for its delicate shape and contrasting coloration. Native to Brazil, it comes from forest streams in the rio Madeira basin, where it lives in warm, soft water often colored by organic matter. Its peaceful, schooling behavior makes it an appealing choice for a carefully planned community aquarium. This species remains rarely available in the aquarium trade. The specimens offered here are wild collected and are available exclusively from Ton.Fish in Canada.

General description

Hyphessobrycon weitzmanorum is a small characid that should be kept in a group. It is continuously active without being excessively nervous when the aquarium provides shaded areas, dense vegetation and open swimming space. Its small size and peaceful temperament suit a quiet community aquarium with similarly sized tankmates. Like many small Amazonian tetras, it responds well to stable, well-filtered water with low nitrogen waste. The species is considered rare to uncommon in the trade, making it especially attractive to aquarists who appreciate less frequently seen fish.

Geographic origin and biotope

This species is associated with the rio Madeira basin in Brazil, particularly around the rio Juma, a tributary of the rio Aripuanã. It inhabits small, forested streams with gentle flow, soft water and often slightly acidic conditions. The natural habitat is usually shaded by the canopy, with diffuse light, roots, submerged branches and leaf litter on the bottom. In an aquarium, tannin-tinted water, gentle filtration and abundant vegetation recreate its native conditions more effectively than a brightly lit, shelterless layout.

Precise locality and local name

The locality generally associated with Hyphessobrycon weitzmanorum lies within the rio Juma system, in the rio Madeira basin of Brazil. This Amazonian region includes many small forest tributaries whose conditions vary seasonally. No widely established Brazilian vernacular name is commonly associated with the species; in the specialist trade, it is mainly identified by its scientific name or by the English name Weitzman’s tetra. Its restricted natural distribution contributes to its limited availability for aquarists.

Appearance and physical characteristics

Hyphessobrycon weitzmanorum has the slender body typical of small tetras, with a shape suited to midwater swimming. Its coloration is generally silvery to translucent, accented by dark markings and reddish tones in the fins, especially after proper acclimation. The delicate fins and contrast are enhanced over a dark substrate, under subdued lighting and in slightly tinted water. Its small size, slender body and contrasting coloration are its main aquarium characteristics. A properly sized group also allows its synchronized movements to be observed more naturally.

General diet

In nature, Hyphessobrycon weitzmanorum likely feeds on small prey, zooplankton and organisms found near the surface or among vegetation. In the aquarium, it accepts small dry foods, but its condition and coloration benefit from a varied diet. Offer small portions of fine pellets or quality flakes, supplemented with frozen or live foods such as baby brine shrimp, daphnia and microworms. Food must be small enough for its mouth. A varied diet offered in small portions supports growth, activity and the expression of its natural colors.

Essential data

• Original river: Rio Juma, rio Madeira basin
• Local name used: Weitzman’s tetra; no widely established Brazilian vernacular name
• Origin of the scientific name: Hyphessobrycon is a Greek-derived genus name; weitzmanorum honors the Weitzmans
• Full-name etymology: Hyphessobrycon: hyphesson, smaller, and brykon, biting fish or small fish; weitzmanorum: plural genitive form honoring the Weitzmans
• Common/vernacular names: Weitzman’s tetra; Weitzman tetra
• Family: Characidae
• Subfamily: Characinae
• Name pronunciation: hy-feh-soh-BRY-kon - wites-MAN-or-um
• Discovery: Flávio César Thadeo de Lima and Jansen Zuanon, 2004
• Maximum adult size: approximately 3.5 cm
• Water temperature and pH: 24 to 28 °C; pH 5.5 to 7.0
• Stream appearance and surrounding vegetation: shaded forest streams with roots, branches, leaf litter and dense marginal vegetation
• Typical tankmates: peaceful small Amazonian tetras, small corydoras and quiet small loricariids
• Temperament and behavior: peaceful, schooling and active in midwater
• Water depth: shallow to moderate in small forest tributaries
• Sexual dimorphism: mature females are generally rounder-bodied
• Bottom configuration and flow: sand or fine silt, leaf litter, submerged roots and slow to moderate flow

In your aquarium

Success with Hyphessobrycon weitzmanorum depends on keeping a group in warm, stable water and providing a layout rich in plants, roots and shaded areas. A dark substrate helps reduce shyness and emphasizes its coloration. Avoid boisterous or much larger tankmates. Fine varied foods, moderate filtration and regular water changes are important, particularly with wild-collected fish. Its rarity and exclusive availability from Ton.Fish in Canada make it a choice for aquarists prepared to provide carefully adapted conditions.