Red Sumatran betta
Betta rubra
A wild betta with an intense reddish livery and dark lateral bands, native to the blackwater environments of northern Sumatra's forests. Unlike bubble-nesting bettas, it belongs to the paternal mouthbrooding group: the male collects fertilized eggs in his mouth and holds them for 12–17 days without feeding — a fascinating natural spectacle to observe. Relatively peaceful among conspecifics compared to other bettas, tannins in the water are considered crucial for its health and optimal coloration. Fry, upon release, are already relatively large and immediately accept baby brine shrimp.
Température de l’eau
22 - 27 °C
Valeur du pH
5 - 6.5
Type d'eau
Eau douce
Niveau dans le bac
Fond et milieu
Taille adulte
5 cm
Volume minimal du bac
>= 40 L
Groupe minimal
>= 2
GH
1 - 5 dGH
KH
1 - 2 dKH
TDS
25 - 95 ppm
Conductivité
39 - 148 uS/cm
Description de l'espèce
Geographical Origin and Habitat: Endemic to northwestern Sumatra (Indonesia), typical of the areas surrounding Lake Toba. Lives in isolated forest pools and swampy rivers surrounded by humid forests, with muddy bottoms densely covered with decaying plant remains.
Taxonomy and Morphology: Toba Betta (Betta rubra). Believed extinct for almost a century and then rediscovered. Stocky and colorful body, with a massive head adapted for oral incubation. Has short rounded fins and no sail-like dorsal fin.
Social Behavior: Fairly shy, but within the group (to be kept in single-species schools) intricate hierarchies are created. Males can persistently peck at each other for territory and mating but rarely inflict serious damage.
Coloration and Sexual Dimorphism: Exceptional bright fiery red or carmine livery with vertical black "blocks" in dominant males. A characteristic black stripe borders the head. Females are noticeably duller (gray or pinkish) with dark horizontal stripes.
Soins, reproduction et cohabitation
Aquarium Setup: Dedicated 60 cm (24 inches) tank (for a harem or group). Natural "Blackwater" layout with dense plant cover and a soft carpet of Ketapang leaves. Lighting must be dim and water flow practically absent (slow at the surface).
Diet and Feeding: Omnivore with marked protein/insectivorous needs. Compared to other "wilds" it easily adapts to granular foods, but the red of the livery disappears if not regularly supplemented with Drosophila, live Daphnia and red bloodworms.
Water Quality: Suffers immensely from high nitrates. The ideal water is soft (RO mixed or filtered on peat) with a markedly acidic pH (5-6.5). Keep the lid tightly closed to avoid thermal shocks to the labyrinth.
Compatibility and Cohabitation: Perfect in a "Species only" tank. If obligated, cohabits with small Southeast Asian loaches or microscopic rasboras. Inserting more lively fish will induce the Betta rubra to literally disappear from sight, remaining holed up and terrified.
Aquarium Breeding: Mouthbrooder. During courtship, the male's red becomes dazzling. Incubation lasts about 12-14 days; a stressed male in this phase risks swallowing the eggs. It is better to place the male in a separate nursery.
Risks and Diseases: Fish tuberculosis (Mycobacteriosis) in case of a drop in water quality. It is a demanding fish and subject to fin rot caused by bacterial infections if kept in waters that are too hard (alkaline).
Origine et répartition géographiques
Endemic to northwestern Sumatra (Indonesia), typical of the areas surrounding Lake Toba. Lives in isolated forest pools and swampy rivers surrounded by humid forests, with muddy bottoms densely covered with decaying plant remains.
Origine
Amérique centrale et CaraïbesAsie du Sud et du Sud-EstAsie de l'Est
Profil de poisson
- Tempérament
- Territorial
- Betta rubra is relatively peaceful compared to other members of the genus, but it does exhibit territorial behavior, particularly among competing males. Minor chasing and fin-nipping can occur during courtship or when establishing hierarchies, though serious physical injuries are rare in a well-decorated tank. Brooding males become notably shy and reclusive, requiring quiet zones where they can hide undisturbed during the incubation period.
- Régime alimentaire
- Carnivore
- In their natural habitat, Betta rubra feeds primarily on insects, insect larvae, and other small aquatic invertebrates. In the aquarium, they will eventually accept high-quality dry foods, but their staple diet should consist of live or frozen options such as Daphnia, Artemia, and bloodworms. Feeding small insects like fruit flies (Drosophila) is also highly recommended, but caretakers must avoid overfeeding as these fish are prone to obesity.
- Espérance de vie
- 3-5 years
- Taille adulte
- 5 cm
- Ratio des sexes
- 1:1 ratio
- Betta rubra is most commonly and safely kept in single pairs (a 1:1 ratio), which is highly recommended for smaller aquariums to minimize territorial disputes. In larger, well-structured setups, group keeping is possible, often favoring a "reverse trio" of two males and one female to prevent the female from overly harassing a single male during courtship. Providing ample cover, leaf litter, and visual barriers is crucial when keeping multiple specimens together to mitigate conspecific aggression and territorial squabbles.
- Fréquence d'alimentation
- Twice daily
- For adult Betta rubra, feeding once or twice a day with small portions that are consumed within a few minutes is recommended. For growing juveniles and fry, offering smaller amounts of food two to three times daily is preferred to support their rapid metabolism and growth rate. A weekly fasting day is highly beneficial for adults to help prevent digestive blockages and maintain optimal body weight.
- Charge biologique
- Low
- Betta rubra has a low biological waste production due to its small adult size of approximately 3 to 4 centimeters. However, it requires efficient biological filtration that does not create strong currents, making a gentle, air-powered sponge filter the ideal choice. As a blackwater species, it is highly sensitive to the accumulation of organic waste and fluctuations in water quality, necessitating frequent, small water changes rather than large, disruptive ones.
- Courant
- Stagnant
- Betta rubra prefers a weak, gentle water flow, replicating the slow-moving ditches and stagnant peat swamps of their native Sumatran habitat. Strong water currents will stress the fish, cause physical exhaustion, and make swimming difficult for this labyrinth species. Utilizing an air-powered sponge filter or heavily baffling the outflow of a power filter is highly recommended to maintain a calm environment.
- Risque de saut
- Yes
- Betta rubra is an exceptional jumper and poses a very high risk of escaping through even the smallest gaps in the aquarium cover. It is absolutely necessary to secure the tank with a tight-fitting lid or cover slide, leaving a small pocket of humid air above the water. This air gap is critical not only to prevent jumping but also to ensure the fish can breathe the warm, humid air required to keep their labyrinth organ functional.
- Reproduction
- Mouthbrooder
- Betta rubra is a paternal mouthbrooder, where spawning involves a characteristic embrace after which the eggs are caught in the female's anal fin and then collected by the male. The male broods the eggs in his mouth for approximately 10 to 17 days before releasing fully formed, free-swimming fry. Breeding is of moderate difficulty, requiring soft, acidic water and a tightly covered tank to maintain a humid air layer above the surface, which is critical for the fry's labyrinth organ development.
- Compatibilité et compagnons
- Peaceful
- Betta rubra is not recommended for standard community aquariums, as larger or more active fish will easily intimidate them and outcompete them for food. They can be successfully housed with very peaceful, small tankmates that thrive in similar soft, acidic blackwater conditions, such as tiny cyprinids or peaceful loaches. However, keeping them in a dedicated single-species tank is always the preferred approach, especially if breeding is the primary goal.
- Niveau dans le bac
- Middle/Bottom
- Betta rubra primarily occupies the bottom and middle zones of the aquarium, spending much of its time navigating through dense vegetation, leaf litter, and driftwood crevices. However, as a member of the labyrinth fish family, it frequently visits the surface to breathe atmospheric air. Providing floating plants is highly beneficial, as they offer shade and security when the fish venture to the top layer to use their labyrinth organ.
Modèles et paramètres scientifiques
FishBase
Fenêtre sur les données scientifiques officielles de l’espèce
FishBase v25.04Données synchronisées le : 15/06/2026
- Niveau trophique
- 3,2 ± 0,4 se
- Résilience
- Élevée (moins de 15 mois)
- Singularité phylogénétique (PD50)
- 0.5
- Relation bayésienne longueur-poids
- a = 0.01, b = 2.97
- VulnérabilitéVulnérabilité faible (10 / 100)
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