Ember Tetra

The Ember Tetra is a diminutive characin native to the Rio Araguaia basin in central Brazil. Described scientifically in 1987, it is among the smallest members of the tetra family kept in freshwater aquaria worldwide. It belongs to the family Characidae and is closely related to other small Hyphessobrycon species. Wild populations are considered stable, though its native range is more restricted than many widely distributed tetras. In its native marshy waters it forms an important prey item for larger fish while itself feeding on minute invertebrates, contributing to the food web of small blackwater tributaries.

Key field marks:

• Very small, slender body rarely exceeding 2 cm
• Overall glowing translucent orange to fiery red coloration
• Lack of bold black markings, spots, or bars found on many related tetras
• Rounded dorsal, anal, and caudal fins tinted the same reddish-orange hue
• Large, dark eye relative to head size Its diminutive size and uniform ember-orange glow, without black shoulder spots or stripes, readily distinguish it from similarly colored but larger or more patterned tetras.

Ember Tetras are native to slow-moving streams, marshes, and flooded forest pools within the Rio Araguaia drainage of central Brazil. They inhabit warm, soft, acidic blackwater conditions typically stained by decaying leaf litter and tannins, with temperatures around 23-28°C. Dense marginal vegetation and submerged root tangles provide cover from predators in these shallow, slow-current habitats. Their relatively restricted native range makes them more geographically localized than many other popular tetra species, being tied closely to specific tributary systems within the greater Araguaia-Tocantins basin.

Ember Tetras are peaceful, highly social fish that form tight, constantly moving shoals, a behavior that provides protection given their small size. They feed on minute invertebrates, zooplankton, and organic particles drifting in the water column, foraging steadily throughout daylight hours. Spawning occurs through egg-scattering among fine plants or leaf litter, typically in response to soft, warm water conditions, with no parental care afterward. As one of the smallest characins, they serve as an important prey species for larger fish in their native marshes, while their shoaling instinct helps reduce individual predation risk.