Lixianjiang

Schistura callichromus is a nemacheilid loach recorded only from the Babianjiang River in the Red River basin, Yunnan Province, China. It is expected to occur in Vietnamese waters as well, and Kottelat (2012) amended the spelling of its name to 'callichroma'. Wild specimens have been observed living in social aggregations of up to six in clear, well-oxygenated headwater streams.

Sinogastromyzon tonkinensis is a hillstream loach that appears endemic to the lower Red River drainage in southern China and northern Vietnam. It is poorly known in the hobby but appears to have been exported on a handful of occasions. It occurs alongside three congeners, which are most easily separated by the barbels and mouth width, and it dwells in swiftly-flowing streams and headwaters.