Ben Hai basin

Tanichthys micagemmae is a small cyprinid from the Ben Hai river system in north central Vietnam. Sold under trade names such as 'Vietnamese minnow', 'cardinal minnow' and 'royal white cloud', it is smaller than T. albonubes, lacks that species' reddish-brown body colour and has reddish ventral and anal fins. At the type locality it was found only in the margins of a fast-flowing, shallow stream where the flow was much reduced.