Angelicus Loach (Burmese Border Loach)
Botia kubotai
Discovered only in 2004 but instantly becoming an aquarium sensation, the Botia kubotai (Angelicus Loach) boasts probably the most intricate and spectacular pattern of the entire family. It is a superlative alternative to the Clown Loach for those with medium-sized aquariums: it remains considerably smaller (about 13-15 cm / 5-6 inches) while maintaining the exceptional gregarious character, the voracity towards pest snails, and the hilarious, continuous hierarchical skirmishes within the school.
Température de l’eau
24 - 28 °C
Valeur du pH
6.5 - 7.5
Type d'eau
Eau douce
Niveau dans le bac
Fond et milieu
Taille adulte
15 cm
Volume minimal du bac
>= 200 L
Groupe minimal
>= 5
GH
4 - 12 dGH
KH
2 - 6 dKH
TDS
80 - 240 ppm
Conductivité
125 - 375 uS/cm
Description de l'espèce
Geographical Origin and Habitat: Endemic to the border rivers between Myanmar and Thailand, specifically the Salween River system. Inhabits shaded streams with clear, fast, highly oxygenated water and substrates of gravel or round rocks.
Taxonomy and Morphology: Burmese Border Loach (Botia kubotai). Described recently (2004) in honor of Katsuma Kubota. Very similar to B. histrionica, but develops an intricate light net pattern on a blackish background with age. Tapered body, equipped with a subocular spine.
Social Behavior: Extremely intelligent and interactive, but needs to live in a hierarchical group (min. 5 specimens). They form complex social dynamics, sleep together in a single tube and often rest lying on one side, appearing dead (normal behavior).
Coloration and Sexual Dimorphism: Juveniles have large dark spots outlined in yellow, which in adulthood transform into a labyrinth of thin light lines on an almost black background, dotted or netted. Females in heat have a huge belly, males are slender.
Soins, reproduction et cohabitation
Aquarium Setup: Long river aquarium (min. 120 cm / 48 inches). Fine sand is an absolute must. Fast-moving water, smooth rocks forming large cavities and woods. Dim light to indulge their shy and moderately nocturnal nature.
Diet and Feeding: Benthic omnivores, relentless with snails. Accept sinking carnivorous pellets, krill, bloodworms and brine shrimp, but need plant fiber: pieces of zucchini and spirulina wafers are highly appreciated.
Water Quality: Very demanding on dissolved oxygen. If the filter slows down or oxygen drops, they will hover near the pump outlet. Very low nitrates and weekly changes are necessary for a long life cycle (they live over 10 years).
Compatibility and Cohabitation: They can bully slow or long-finned fish if they get bored. Ideal companions are large fast Cyprinids, Crossocheilus or Garra that live in the same high-energy environment.
Aquarium Breeding: Totally absent. They are fish bred in fish farms (with the aid of hormonal induction). The conditions of their natural breeding environment are almost unknown to date.
Risks and Diseases: High risk of Ich if the temperature is not stable or during transport. The barbels are subject to permanent bacterial corrosion if the hygiene of the bottom sand is not guaranteed.
Origine et répartition géographiques
Endemic to the border rivers between Myanmar and Thailand, specifically the Salween River system. Inhabits shaded streams with clear, fast, highly oxygenated water and substrates of gravel or round rocks.
Origine
Asie du Sud et du Sud-Est
Profil de poisson
- Tempérament
- Peaceful
- This species has a peaceful but very active and playful temperament. They exhibit complex social behaviors within their group, including minor mock battles to establish dominance, which should not be confused with true aggression. While they are generally peaceful toward other species, their energetic swimming behavior might stress very slow-moving or shy tankmates. They are diurnal and show curiosity, often interacting with their environment and exploring caves together.
- Régime alimentaire
- Omnivore
- Botia kubotai is an omnivorous species with a preference for carnivorous foods. In the wild, they feed on insects, worms, snails, and other aquatic invertebrates, though they will also consume soft-leaved plants and algae. In captivity, they should be offered a varied diet consisting of high-quality sinking pellets, frozen or live foods like bloodworms and brine shrimp, and fresh vegetables such as cucumber or blanched spinach. They are also excellent natural control agents for pest snail populations in the aquarium.
- Espérance de vie
- 8-12 years
- Taille adulte
- 15 cm
- Ratio des sexes
- Group
- This species is highly social and should never be kept alone, as isolation leads to severe stress and abnormal behavior. It is recommended to keep them in a group of at least five to six individuals to establish a natural social hierarchy. There is no specific male-to-female sex ratio required, as they are not easily sexed and are kept as a community shoal. A larger group helps distribute any minor territorial squabbles among themselves and keeps individual fish secure.
- Fréquence d'alimentation
- Twice daily
- It is recommended to feed Botia kubotai two to three times a day in small portions that they can consume within a few minutes. Since they are bottom feeders, care must be taken to ensure that food actually reaches the substrate before being eaten by faster mid-water fish. Feeding them varied meals throughout the day supports their high energy levels and maintains their health. Any uneaten food should be removed promptly to prevent water quality degradation.
- Charge biologique
- Medium
- Botia kubotai is an active and relatively large loach that requires clean, well-oxygenated water to thrive. Although individual waste production is moderate, they must be kept in social groups, which increases the overall biological load on the aquarium. Robust filtration, such as a canister filter with a turnover rate of at least 4–5 times the tank volume per hour, is essential. Regular weekly water changes of 30–50% are necessary to prevent the accumulation of harmful nitrates and organic waste.
- Courant
- Strong
- This loach species originates from clear, fast-flowing hill streams and rivers, meaning they prefer moderate to strong water flow. A strong current helps mimic their natural habitat, keeps the water highly oxygenated, and encourages natural swimming behaviors. The use of powerheads, wavemakers, or spray bars from canister filters can help create the desired flow. Good oxygenation is critical for this species, as they do not tolerate stagnant or oxygen-poor water.
- Risque de saut
- Yes
- Botia kubotai is a known jump risk and can easily escape from an uncovered aquarium. They are highly active, inquisitive, and easily startled, which can cause them to dart upwards and jump out of the water. It is absolutely mandatory to have a tight-fitting lid or glass covers with no open gaps around filter pipes or wires. Any small openings should be blocked with sponges or mesh, as these loaches can squeeze through surprisingly tight spaces.
- Reproduction
- Oviparous
- Breeding Botia kubotai in the home aquarium is extremely difficult and rarely documented. They are egg-scatterers, and successful spawning typically requires mimicry of seasonal monsoon conditions, including major water changes and temperature drops. Most specimens available in the aquarium trade are either wild-caught or bred commercially using hormone stimulation. In a standard home setup, accidental spawnings are exceptionally rare and require large, mature tanks with pristine water.
- Compatibilité et compagnons
- With caution
- The Polka Dot Loach is compatible with a wide range of community fish that share similar water requirements. Suitable tankmates include active, robust schooling fish like larger tetras, danios, rasboras, and other peaceful bottom-dwellers such as Corydoras or other loaches. They should not be kept with long-finned or very slow-moving fish like guppies or angelfish, which might be nipped or stressed by the loaches' active nature. Additionally, small ornamental shrimp and snails should be avoided, as they will likely be eaten.
- Niveau dans le bac
- Middle/Bottom
- The Polka Dot Loach is primarily a bottom-dwelling species that spends much of its time foraging along the substrate. However, once acclimated and comfortable in their environment, they are active swimmers that will frequently explore the middle levels of the aquarium. They are very curious and will check out every corner of the tank in search of food or hiding spots. Providing plenty of caves, driftwood, and rocks at the bottom will encourage them to swim confidently throughout the lower and middle zones.
Modèles et paramètres scientifiques
FishBase
Fenêtre sur les données scientifiques officielles de l’espèce
Données synchronisées le : 15/06/2026
- Niveau trophique
- 3,2 ± 0,4 se
- Singularité phylogénétique (PD50)
- 0.502
- Relation bayésienne longueur-poids
- a = 0.00589, b = 3.08
- VulnérabilitéVulnérabilité faible (10 / 100)
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