Rohan's Barb is a Western Ghats endemic with iridescent scales and a peaceful temperament, making it ideal for spacious community aquariums.
Overview
Dawkinsia rohani, known in the aquarium hobby as Rohan's Barb, is an attractive freshwater fish belonging to the Cyprinidae family. This species is endemic to the mountain rivers and streams of the Western Ghats in southern India — one of the most biodiverse regions on Earth. In the wild, these fish inhabit fast-flowing waterways with rocky substrates and clean, well-oxygenated water.
Rohan's Barb reaches a size of 10–12 cm, making it a medium-large representative of the genus. Its body is adorned with iridescent scales that shimmer with various hues under light, while elongated fins give the fish an elegant appearance. Despite belonging to the barb family, which is often associated with boisterous behavior, Dawkinsia rohani has an exceptionally peaceful disposition and is perfectly suited for community aquariums.
Tank Requirements
A comfortable group of Rohan's Barbs requires an aquarium of at least 120 liters. These active fish need ample swimming space, so elongated tanks are preferred. The optimal water temperature is 22–28 °C, pH should be maintained at 6.5–7.5, and general hardness (GH) at 5–15 dGH.
The aquarium should be equipped with a powerful filter that creates a noticeable current, replicating the natural conditions of mountain rivers. Fine gravel or sand works well as a substrate. Decor may include smooth river stones, driftwood, and clusters of hardy plants, while leaving plenty of open swimming space. A secure lid is essential — these fish can jump when startled. Weekly water changes of 20–25% will help maintain stable water quality.
Feeding and Diet
In the wild, Dawkinsia rohani feeds on small invertebrates, insect larvae, algal growth, and detritus. In the aquarium, these fish are unfussy eaters and readily accept high-quality dry foods — flakes and appropriately sized pellets.
To maintain health and vibrant coloration, it is important to diversify the diet. Regularly offer live or frozen foods such as bloodworms, daphnia, brine shrimp, and cyclops. A vegetable component is also essential — blanched spinach, zucchini, or spirulina flakes. Feed twice daily in small portions that the fish consume within 2–3 minutes to avoid overfeeding and water quality deterioration.
Care and Maintenance
Rohan's Barb is considered an undemanding species (care level 2 out of 5), making it a good choice for aquarists with limited experience. The key to successful keeping is stable water parameters and regular aquarium maintenance.
Perform weekly water changes of 20–25% and clean the substrate with a gravel vacuum. Monitor filter performance and rinse filter media in aquarium water as needed. Regularly test key water parameters — temperature, pH, ammonia, and nitrite levels.
This is a schooling species and should be kept in groups of at least 6 individuals. In a school, the fish feel more confident, display natural behavior, and show more vivid coloration. Solitary specimens often become shy and pale.
Compatibility
Thanks to its exceptionally peaceful nature (aggression level 1 out of 5), Rohan's Barb is one of the best candidates for a community aquarium among barb species. It coexists well with most non-aggressive fish of comparable size.
Good tank mates include other peaceful barbs such as the Cherry Barb, as well as rasboras, danios, peaceful tetras, Corydoras catfish, and small plecostomus species. They can also be kept with peaceful gouramis, such as the Dwarf Gourami.
Avoid housing them with aggressive or territorial cichlids, large predatory fish, or very small species that a larger barb might inadvertently intimidate. Keeping them with long-finned varieties is not recommended — even a peaceful barb may nip at trailing fins.
Breeding
Breeding Dawkinsia rohani in the aquarium is possible, though it requires some effort (difficulty level 3 out of 5). This is an egg-scattering species that shows no parental care.
For spawning, prepare a separate tank of 60–80 liters with fine-leaved plants or a spawning grid on the bottom. The water should be soft (GH 5–8), slightly acidic (pH 6.5–6.8), and warm (26–28 °C). Increasing the current can stimulate spawning behavior, mimicking the rainy season.
Before spawning, separate the breeding pair and feed them generously with live foods for 1–2 weeks. Females can be identified by their rounder bellies. When introduced to the spawning tank, the female scatters eggs that sink to the bottom or adhere to plants. Remove the adults immediately after spawning, as they will consume their own eggs.
The fry hatch within 24–48 hours and begin free-swimming after 2–3 days. Initial foods include infusoria and microworms, followed by baby brine shrimp. As the fry grow, gradually transition them to crushed flakes and small pellets.