Botia dario, commonly known as the Queen Loach or Bengal Loach, is a medium-sized botiid loach native to the Brahmaputra river system and surrounding drainages in India and Bangladesh. It displays a bold pattern of alternating dark brown to black and pale cream to orange-yellow vertical bars across the entire body, giving it a vivid striped appearance. The coloration is particularly bright in well-maintained, socially housed specimens.
Reaching up to 12 cm, it is a robustly built loach that inhabits fast to moderately flowing rivers and streams with sandy, rocky, or mixed substrates. Like all Botia species, it is equipped with a sharp suborbital spine beneath each eye that can be used defensively — a feature to be mindful of when handling or netting the fish.
In the aquarium, the Bengal Loach is active, bold, and entertaining. It is a confirmed snail predator and will systematically reduce pest snail populations. Keeping it in a group of at least five is essential — solo specimens become stressed and may become aggressive toward other species. Within a proper social group, the Bengal Loach is a lively and enjoyable community fish for tanks with medium to larger peaceful companions. Bengal Loaches from different river systems may display subtle pattern variations — some populations showing more orange or yellowish tones in the pale bars, others appearing with cooler cream tones. This natural variability within the species is appreciated by collectors who enjoy maintaining multiple specimens and comparing individual markings.
