Dario kajal was described from the Barak river drainage in the Cachar district of Assam, one of the most biodiverse freshwater regions in South Asia. It is closely related to D. dario but is distinguished by its distribution in the Barak rather than Ganges basin and by subtle differences in colour pattern. Males in full display are extraordinary: deep red-orange barring separated by electric blue iridescent scale rows, producing a pattern that evokes tropical reef fish rather than an inland stream species.
Successful keeping requires the same approach as for other Dario species. A dedicated nano planted aquarium with very gentle filtration, micro live foods, and low competition from other species is essential. The diminutive size of these fish means that even mild competition at feeding time can result in starvation. Dense vegetation and multiple caves allow natural territorial behaviour without injury.
Paternal cave-spawning is documented for this species. Breeding is achievable in captivity using a dedicated breeding tank of around 20 litres with abundant fine-leaved plants and at least one cave. Fry are extremely small and require infusoria or commercial nano fry food for the first week.
