Rosy barb

Water parameters

Tolerated range for this species. Aim for the middle of each band rather than the extremes.

Tank and habitat

Substrate: any.

Behavior

Plant interaction: may nibble soft.

Feeding

Omnivore that eats everything. Flake, pellets, frozen bloodworm, frozen brine shrimp, frozen daphnia, blanched vegetables (peas, zucchini, spinach), algae wafers, and live food. They graze on algae in addition to accepting prepared foods. Feed twice daily. The rosy-red coloring in males improves with carotenoid-rich foods (brine shrimp, krill, spirulina). Overfeeding is easy because they eat relentlessly; moderate portions keep them fit.

Compatibility

• Hardy, active schooling barb. Peaceful by barb standards; minimal nipping behavior. Works with most medium-sized community fish.
• Groups of 6+ bring out the best coloring and behavior. Males in breeding condition turn deep red-pink and compete for female attention with fin displays.
• Tolerates cooler water (16–25°C), making them one of the few tropical barbs suitable for unheated tanks in temperate climates. Good companions for goldfish (in large enough tanks), white clouds, and other subtropical species.
• Larger than many common barbs at 10–14 cm for mature adults. They need more space than their juvenile size suggests. A group of adults needs 150 L.

Origin and habitat

Widely distributed across southern Asia, from Afghanistan through Pakistan, India, Nepal, and Bangladesh; also reported from Myanmar. Described by Hamilton in 1822 from ponds of northeastern Bengal and the Kosi and Ami rivers. Adults inhabit lakes and fast-flowing hill streams in subtropical climates. The recorded temperature range is 18–22°C, confirming its subtropical nature. Populations vary in coloration and size depending on locality; specimens from the Siwalik mountains in northern India are reportedly among the most colorful. Males in breeding condition develop a deep rosy-red body that gives the species its common name; the difference between males and females is clearly visible, with males much redder and leaner. Grows to a maximum of 14 cm total length; in aquariums they typically remain smaller at 5–6 cm, while wild fish can reach 12 cm. Moved from Puntius to the genus Pethia by Pethiyagoda et al. in 2012. No wild-caught specimens are found in the trade; all are commercially bred and selected for color. Introduced worldwide and established in non-native waters in multiple countries. IUCN Least Concern.

Breeding

Easy egg scatterer that breeds prolifically. Condition males and females separately with frozen food for a week. The breeding tank needs fine-leaved plants or spawning mops and clean water; temperature and chemistry are not critical. Males in breeding condition turn deep red and chase females aggressively. Spawning happens in the morning, usually in bursts among plant material. The pair scatters 200-400 eggs. Eggs are semi-adhesive and settle on plant surfaces and the substrate. Adults eat eggs immediately, so remove them after spawning. Eggs hatch in 30-36 hours. Fry become free-swimming in 2-3 days and take baby brine shrimp. Growth is fast; juveniles reach 3–4 cm within 2 months. Rosy barbs are bred commercially in enormous quantities in outdoor ponds. Home breeding is a simple project suitable for beginners.

Common problems

Size surprise is the main issue for new keepers. A 4 cm juvenile in the store doesn't convey the 12 cm adult that arrives in a year. A group of 6 adult rosy barbs needs a proper mid-sized tank, not the 60-liter nano they started in. Health problems are exceptionally rare. This is one of the hardiest freshwater fish in the hobby. Ich is uncommon except in severely stressed new arrivals. They tolerate a wide range of water conditions and medications. The main cosmetic concern is that males only show the full rosy-red color during breeding condition or when kept in mixed-sex groups with competition. Males in all-male tanks or males not in breeding condition can look plain olive-gold.

Outdoor pond suitability

Climate

subtropical

USDA zones

8–12 (winter low around -12°C or warmer)

Outdoor pond at least 60 cm deep for thermal mass. Local frost depth and surface freezing matter.

Bioload

Further reading

• How to cycle a fish tank
• Stocking ideas by tank size