Checker Barb (Oliotius oligolepis)

Oliotius oligolepis (formerly Barbus oligolepis, Capoeta oligolepis), the Checker Barb, is a charming small barb from the rivers and streams of Sumatra, Indonesia. Its common name perfectly describes its most distinctive feature: the large, dark-edged scales create a geometric checked or chequered pattern across the flanks, giving the fish an unusual and attractive texture to its appearance.

Males develop vivid colouration with age: reddish-orange fins, particularly in the dorsal and caudal fins, complemented by dark fin margins. The body retains the checker-scale pattern. Females are less colourful, with more transparent fins and the same checked body pattern.

The Checker Barb is one of the more peaceful barb species available — significantly less prone to fin-nipping than species like the Tiger Barb or Rosy Barb. This makes it suitable for community tanks with longer-finned species (with caution) and a wider range of tank mates. In groups of eight or more, any residual nippy tendency is directed inward toward group members.

Growing to approximately 5 cm, the Checker Barb is a manageable size for medium community aquariums and planted tanks. It is an egg-scattering species that spawns among fine-leaved plants — breeding in a planted aquarium is possible without special intervention.

Tank Setup: A minimum 60-litre aquarium for a school of eight. Moderate water flow, dense planting at the sides and back, open swimming lanes in the midwater. Fine to medium substrate. A lid is recommended — barbs can be active jumpers.

Water Parameters: Temperature 20–26°C; pH 6.0–7.5; GH 5–15 °dH; KH 2–8 °dH. Adaptable to a moderate range of conditions. Prefers slightly cooler water than many tropical fish, reflecting its Sumatran highland origin.

Feeding: Omnivore. Accepts quality flake, micro pellets, frozen bloodworm, brine shrimp, Daphnia, and blanched vegetables. Feed twice daily. Enthusiastic feeders that compete well at mealtimes.

Tank Mates: More compatible than most barbs. Suitable with medium tetras, rasboras, gouramis, corydoras, loaches, livebearers, and even longer-finned species (monitor for nipping). Avoid very small nano fish.

Behaviour: Active, schooling mid-water fish. Groups of 8+ display natural shoaling behaviour. Males display to each other with colour intensification. Less nippy than Tiger Barbs but monitor with long-finned tank mates.

Health: Hardy and disease-resistant. Prefers cooler water — susceptible to disease if kept consistently above 27°C. Weekly 25% water changes maintain excellent health.