Encyclopaedia
Black Ruby Barb
Puntius nigrofasciatus
Native to southern Sri Lanka, inhabiting slow-flowing, shaded forest streams with gravel beds covered in leaves. Prefers cool and clear waters.
- Family
- Cyprinidae
- Origin
- Asia: shaded forest streams of southern Sri Lanka.
- Origin
- Extra-Amazon South AmericaSouth and Southeast Asia
- Tank use
- Used in 0 tanks
Share
20 °C - 26 °C
6 - 7
Freshwater
Metà
6 cm
Species description
Geographical Origin and Habitat: Native to southern Sri Lanka, inhabiting slow-flowing, shaded forest streams with gravel beds covered in leaves. Prefers cool and clear waters.
Taxonomy and Morphology: Also known scientifically as Pethia nigrofasciata, it belongs to the Cyprinidae family. It features a deep-bodied, laterally compressed shape, growing to 6.0 cm.
Social Behavior: An active yet peaceful schooling species. Must be kept in a group of at least 6 individuals to show schooling behaviors and prevent intimidation of weaker fish.
Coloration and Sexual Dimorphism: Breeding males turn a deep, dark ruby-red on the front half of the body with dark vertical bars. Females are yellowish with less distinct black bars.
Care, breeding and tankmates
Aquarium Setup: An 80-liter tank is recommended. Plant densely along the sides and back, leaving the center open for swimming. Add driftwood and smooth pebbles to replicate the stream bed.
Diet and Feeding: Omnivorous. Readily accepts flakes, granules, and frozen foods like brine shrimp and daphnia. Incorporate vegetable flakes to provide a balanced diet.
Water Quality: Prefers soft, slightly acidic water. Keep temperature at 20-26°C, pH 6.0-7.0, and GH 5-12 dGH. Regular partial water changes are essential.
Compatibility and Cohabitation: Great community fish. Suitable tankmates include tetras, rasboras, Corydoras, and other peaceful barbs. Less likely to nip fins than Tiger Barbs.
Aquarium Breeding: Spawns among fine plants. Spawning usually occurs in the morning. Remove parents immediately after to prevent egg eating.
Risks and Diseases: Susceptible to ich if exposed to sudden water temperature changes. A secure cover is needed as they are active and can jump.
Fish profile
- Temperament
- Pacifico
- Diet
- Onnivoro
- Tank level
- Metà
- Minimum group
- 6
- Adult size
- 6 cm
- Minimum tank volume
- 80 L
- GH
- 5 dGH - 12 dGH
- KH
- 2 dKH - 6 dKH
- TDS
- n/a
- Conductivity
- n/a
- Feeding frequency
- 1-2 volte al giorno
- Bioload
- Medio
- Flow
- Moderato
- Jump risk
- Covered tank required
- Reproduction
- Facile da riprodurre in acqua tenera e acida. Depone uova adesive tra la vegetazione fitta.
- Compatibility & tankmates
- Meno aggressivo rispetto ad altri barbi, non morde le pinne dei coinquilini se tenuto in gruppo.
Ecological Estimates & Biological Models
- Trophic level
- 2 ± 0 se
- Resilience
- High (less than 15 months)
- Phylogenetic uniqueness (PD50)
- 0.5
- Bayesian Length-Weight
- a = 0.01047, b = 3
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Other recommended species with similar care requirements and water parameters.





