Beaufortia kweichowensis, the Chinese Butterfly Loach or Butterfly Hillstream Loach, is the archetypal hillstream loach for most aquarists — the species that introduces thousands of hobbyists each year to the rheophilic world. Its wide, spread pectoral and pelvic fins give it a butterfly-like silhouette from above, and its flattened underside allows it to cling to glass, rocks, and other surfaces in powerful current. Patterning varies between individuals, ranging from dark reticulated to broadly mottled warm brown and cream.
Originally from Guizhou province in southwestern China, it inhabits cool, fast-flowing, highly oxygenated hill streams flowing through karst limestone landscapes. This background means it appreciates slightly harder, more alkaline water than many other hillstream species — a pH of up to 7.5 and moderate hardness are acceptable. Water temperature should remain cool, with the ideal range of 18–24 °C essential for long-term health.
B. kweichowensis is one of the few hillstream loaches bred consistently in captivity, and captive-bred stock is now available. In the aquarium it is hardy, adaptable, and long-lived when properly maintained, with specimens frequently reaching eight years or more. It is mildly territorial with conspecifics but interactions rarely exceed brief lateral posturing displays.
