Ruby barb

The Odessa Barb (Pethia padamya) is a striking cyprinid endemic to the clear, cool streams of central Myanmar, where it inhabits well-oxygenated waters flowing over limestone in the Mandalay region at elevations around 1,000 meters. Known in the aquarium trade since the 1970s, it first appeared via the Ukrainian port of Odessa — hence its common name — and was long mistaken for an artificially dyed fish due to its intense coloration before wild populations were finally discovered in Myanmar in 2003. Males display a brilliant ruby-red band along the flanks that gives the species its specific epithet (padamya meaning "ruby" in Burmese), complemented by translucent fins edged in black and a dark vertical humeral marking, making them one of the most visually striking small barbs available to aquarists.

Despite their vivid appearance, Odessa Barbs are peaceful community fish that thrive in groups of eight to ten or more, where males compete for hierarchy through displays of intensified color and subtle fin flares. They are best maintained alongside comparably-sized open-water cyprinids such as Danio choprae, Danio albolineatus, and Pethia stoliczkana, as well as benthic loaches from the Ayeyarwady basin. As omnivorous foragers, they accept a wide range of foods but develop their finest colors when offered regular live and frozen fare like bloodworm, Daphnia, and Artemia alongside high-quality dried flakes with plant or algal content. A well-planted aquarium with a dark substrate and floating plants to diffuse light provides the ideal setting for showcasing their striking coloration.

As a cool-water barb from high-altitude streams, the Odessa Barb thrives at temperatures between 20–25°C with neutral to slightly alkaline pH and moderate to hard water. A tank with base dimensions of at least 80 × 30 cm (roughly 80 liters) provides sufficient swimming space for a group. Like most small cyprinids, they are egg-scattering free spawners exhibiting no parental care — when well-conditioned, adults spawn regularly and scatter adhesive eggs among fine-leaved plants or spawning mops. The eggs hatch in 24–48 hours, and fry become free-swimming about a day later. Initial foods should be infusoria-grade, progressing to microworm and Artemia nauplii. Adults will consume eggs given the chance, so a separate breeding tank or protective mesh is recommended for raising fry.