Chinese Hillstream Loach

About

Found in the fast-flowing hill streams of southern China, Beaufortia kweichowensis is one of several species sold under catch-all trade names like butterfly loach, Hong Kong plec, or Chinese hillstream loach. A naming situation that causes real confusion at the shop. It's the most commonly available member of its genus, though mixed shipments often include other gastromyzontids, so knowing what you're actually buying takes a little research. The body plan is remarkable: paired fins are laid out horizontally, the head and belly are flattened, and the pelvic fins fuse together to form a powerful suction cup. Rather than swimming freely, these fish crawl and cling across rocks and glass, which is where you'll spend most of your time watching them. Males are bolder than females and will stake out feeding territories, defending them from rival males with occasional squabbles. Females tend to gather in higher-flow zones and are generally tolerated by territorial males. To see the most natural social dynamics, buy a group of at least six. Smaller numbers, especially all-female groups, tend to produce shy, withdrawn fish. Tankmate choices need some thought; species from similar fast-water habitats work best, and despite how they're sometimes sold, goldfish make poor companions. An intermediate-level keeper with a well-oxygenated, current-driven setup will get the most from this fish.