Botia dario (Bengal loach or queen loach) is a species of fish in the loach family Botiidae found in the Brahmaputra and Ganges basins in Bangladesh, Bhutan and north India. The species is overall common in widespread. In Bangladesh, these fish are threatened by pesticide used in the cultivation of rice. Since 1997, the Bangladesh government has enforced strict penalties against polluters, with specific rules about the pollution of streams and waterways, so at least some preservation work is afoot.