Vanmanenia is another genus of hillstream loaches, again in the family Gastromyzontidae, sharing the same fast-water range across China, Vietnam and Laos as its relative Sinogastromyzon. It has the same defining hillstream body plan — a flattened head and body and broadened, fused paired fins forming an adhesive disc for gripping rock in strong current — and most species stay compact, from about 2.5–5.5 in in the atlas, grazing algae from stone surfaces in cool, oxygen-rich streams. A few species, such as V. caldwelli and V. lineata, carry established common names (Caldwell's and the lined hillstream loach), a sign of at least some presence in specialist circles even if the genus as a whole is little known outside them.
Like most hillstream loaches, Vanmanenia are a specialist rather than mainstream aquarium fish, suited only to biotope-style tanks with strong flow and cool, clean, well-oxygenated water rather than a typical community setup. Conservation data are thin: 15 of the atlas's 22 species are Not Evaluated and five more Data Deficient, with only single species formally listed Endangered and Least Concern, so — as with several of the region's hillstream genera — the picture is one of scientific description running well ahead of conservation assessment.