Taxonomy & naming
Heminoemacheilus zhengbaoshani was described by Zhu and Cao in 1987 and stands as the type species of the genus Heminoemacheilus, within the family Nemacheilidae — the stone and brook loaches, by far the largest family in the loach superfamily Cobitoidea. FishBase carries it as species ID 60446 under this combination.
More recent phylogenetic work on Nemacheilidae cavefish, including a molecular study covering this species, recovers it nested within Paranemachilus rather than as a distinct lineage, implying Heminoemacheilus zhengbaoshani may be a synonym of a Paranemachilus species. That question is still being worked through in the taxonomic literature rather than settled, so this entry keeps the described combination, Heminoemacheilus zhengbaoshani, while flagging the synonymy question for readers who encounter the name Paranemachilus attached to the same fish.
Morphology
Detailed morphological description of this species has not been captured from the sources available here, and published accounts of its size and colour pattern are sparse. As a member of Nemacheilidae it can be expected to share the family's general stone-loach build: an elongate, sub-cylindrical body, a flattened head and belly suited to gripping the streambed, and paired fins used to brace against current — but specific measurements for this species are not confirmed in the record consulted, so none are given here rather than guessed.
Its habitat is instructive regardless: it is known from underground aquatic environments, meaning it lives in cave streams rather than open surface water. Many nemacheilids that colonise caves show reduced pigmentation and reduced or vestigial eyes compared with surface relatives, a pattern documented across Nemacheilidae cavefish more broadly, though whether this particular species shows those adaptations is not detailed in the sources available.
Habitat
The species is endemic to Daxin County, Chongzuo City, in the Guangxi Zhuang Autonomous Region of southern China, with its type locality in a tributary of the Zuojiang River. It occupies underground aquatic habitat — a true cave loach, living in subterranean streams rather than open daylight watercourses.
Recorded water temperature at the type locality is 68–77 °F, cool to mild rather than tropical-warm, consistent with the stable, shaded conditions typical of cave and karst groundwater systems in this part of southern China. Beyond temperature, detail on substrate, flow and water chemistry has not been captured here.
Feeding
No specific dietary data for this species has been captured from the sources consulted. As a small benthic member of Nemacheilidae, it can reasonably be expected to forage over the substrate for small invertebrates in the manner typical of the family, but nothing about its actual diet in the cave streams it inhabits is documented in the record available here, and this entry does not extend beyond what the sources support.
Mating
No information on courtship, sexing or spawning behaviour for this species has been captured from the sources available. Stone and brook loaches (Nemacheilidae) as a family are broadly egg-scatterers that pair or group-spawn over gravel in flowing water with no parental care, but nothing specific to Heminoemacheilus zhengbaoshani — a single-locality cave endemic that has, as far as the record here shows, never been kept or observed spawning — can be stated with confidence.
Breeding
This species has no documented aquarium-breeding history. Stone and brook loaches typically scatter eggs over gravel or among stones in fast-flowing water and provide no parental care, and that pattern is the best general expectation for Heminoemacheilus zhengbaoshani, but it is not a fish in the aquarium trade and there is no record of it having been bred, or even maintained, in captivity. Data on this species is genuinely sparse, and that is the honest answer rather than a guess dressed up as fact.
In the aquarium
Heminoemacheilus zhengbaoshani is not an aquarium fish. It is a single-locality cave endemic from underground streams in Guangxi, China, with no history of collection for the trade and no husbandry record to draw on. Like other near-scaleless nemacheilids it should be assumed to be medication-sensitive if it were ever kept, but there is nothing to responsibly recommend about stocking, tank size, water parameters or tankmates for a fish that essentially does not exist in the hobby. Its interest is scientific — as the type species of Heminoemacheilus and a data point in the study of Asian cavefish evolution — rather than as a keepable species.
Conservation
Heminoemacheilus zhengbaoshani has not been evaluated on the IUCN Red List; its status here is recorded as Not Evaluated rather than guessed. As a species known only from a single underground locality in Daxin County, Guangxi, it fits the profile of many cave-restricted nemacheilids: a naturally tiny range that would make it vulnerable to any disturbance of its groundwater system, such as karst quarrying, pollution or changes to local hydrology, even though no formal assessment or population trend has been published to confirm or quantify that risk.