Neolissochilus is a genus of large-growing, barb-bodied cyprinids closely related to the true mahseers, found across South and Southeast Asia; the atlas's records span Myanmar, India, Thailand, China, Indonesia, Malaysia, Vietnam, and Bangladesh. Species inhabit clear, well-oxygenated hill and foothill rivers, often with rocky or gravel beds and moderate to fast current, the same kind of habitat favored by their better-known mahseer relatives. Body form is the classic robust, thick-scaled cyprinid shape with barbels around the mouth, and the genus spans an unusually wide size range for a typical barb: the atlas lists adult sizes from about 2 in up to roughly 47 in, the upper end represented by large riverine species such as the Copper Mahseer (Neolissochilus hexagonolepis), which can grow to a genuinely substantial size.
Neolissochilus draws far more interest from anglers and regional fisheries than from the aquarium hobby; only its largest, most mahseer-like species have any real profile among sport fishers, while most of the 32 species the atlas covers are little known outside taxonomic literature — reflected in an IUCN tally weighted heavily toward Not Evaluated and Data Deficient. The handful of formally assessed species include some rated Vulnerable or Critically Endangered, consistent with the broader pressure on Asian hill-stream fish from damming, sand mining, and overfishing of larger-bodied river species. For home aquaria the genus is a poor general fit: the larger species demand very large systems and strong flow, so Neolissochilus is best understood as a river conservation and fisheries subject rather than an aquarium group.