Betta uberis Care Guide - Aquarium Setup, Diet & Breeding

Betta uberis is a small, beautifully coloured wild betta often known as the black orchid betta. Mature males can display deep red, burgundy, brown-black and iridescent blue or green tones, with extended fins that become especially striking when the fish is displaying. Colour varies considerably between individuals and collection locations.

This species has the elongated body and upturned mouth typical of the Betta genus, along with a labyrinth organ that allows it to breathe atmospheric air. Males may flare and display to rivals, while females are generally less ornate but remain active and observant fish.

In nature, Betta uberis inhabits quiet, shaded waters beneath the rainforest canopy. Dense vegetation, submerged roots and decomposing leaves create a subdued environment with very little current, low mineral content and often strongly acidic, tannin-stained water.

Like other wild bettas, it is a surface-oriented predator that spends much of its time investigating cover and searching for small invertebrates. Its restricted blackwater habitat and continuing pressure on peat-swamp ecosystems make responsible, captive-bred specimens particularly valuable to aquarists.

Betta uberis is native to the island of Borneo in Southeast Asia, particularly the peat-swamp and blackwater habitats of Kalimantan, Indonesia. It is associated with shallow, slow-moving forest waters rich in leaf litter and dissolved tannins.

A single Betta uberis can be kept in an aquarium of around 20 litres, although 30 litres or more is preferable for a pair or a carefully planned community. A footprint of at least 45 × 30 cm is a useful guideline, with a secure lid because bettas can jump and access to humid air above the water. Use gentle filtration with minimal flow, subdued lighting, dense plants, floating cover, wood and leaf litter over a soft sand or fine inert substrate. Tannin-rich botanicals help recreate its shaded peat-swamp habitat, but any leaves or cones should be free from pesticides and replaced as they decompose.

Males reach approximately 4.5 cm (1.8 inches) in total length, while females are usually slightly smaller at around 4 cm (1.6 inches).

Betta uberis is a carnivorous micro-predator. Offer a varied diet of appropriately sized frozen or live foods such as daphnia, mosquito larvae, brine shrimp, cyclops and blackworms, supplemented with a quality soft betta or micropellet food if accepted. Feed small portions and avoid relying on dry food alone, particularly when conditioning fish for breeding.

Betta uberis is best kept in a species aquarium, as males can be territorial and pairs may become incompatible outside breeding. In a spacious, heavily planted blackwater community it can sometimes live with small, peaceful species such as chili rasboras, celestial pearl danios, pygmy corydoras and other quiet soft-water fish. Avoid fin-nippers, boisterous tankmates, large fish and other male bettas; fast-moving community species may also outcompete it for food.

Betta uberis are bubble-nest breeders. Condition a compatible pair with plentiful small live or frozen foods, then provide calm, shallow, acidic water with floating leaves or a broad-leaved plant beneath which the male can build his nest. The male usually gathers the eggs after spawning and tends them in the nest until they hatch. Remove the female if the male becomes aggressive, and consider separating the fry once they are free-swimming, feeding them infusoria or other very small first foods before moving on to newly hatched brine shrimp.

Males are typically more intensely coloured and develop longer, more elaborate fins, especially when mature and displaying. Females are usually shorter-finned, less vividly marked and deeper-bodied, with a visible ovipositor spot when mature.