Taxonomy & naming
Schistura nomi was described by the Swiss ichthyologist Maurice Kottelat in 2000, within his long-running revision of the stream loaches of Laos and the wider Mekong basin. It sits in Schistura, the largest genus of the family Nemacheilidae, itself the largest of all loach families — a sprawling assemblage of small, superficially similar stone and brook loaches spread across South, Southeast and East Asia. The Catalog of Fishes (Eschmeyer, CAS), the standing authority for valid fish names, recognizes Schistura nomi as a valid species in this genus, and that combination has been stable since the original description; unlike many older Nemacheilus- or Noemacheilus-era names, it has not needed reassignment.
The species epithet honors Mr. Nom, who worked as Kottelat's driver during the Lao fieldwork that produced the description — a small, human footnote typical of the long lists of new Schistura named from that era of Mekong-basin survey work. Nemacheilid taxonomy in the region has been reshuffled heavily over the past few decades as older catch-all genera were split apart on the basis of fin-ray counts, pigmentation and osteology, but Schistura nomi has kept the same name and placement since 2000.
Morphology
Schistura nomi is a small fish, reaching only about 2 in in standard length, well within the size range typical of the genus. Like other Schistura it has a slender, elongate, benthic body built for holding position against current, and — as in Nemacheilidae generally — an erectile suborbital spine tucked in a groove beneath the eye, and skin that is effectively naked, with scales, where present, tiny and deeply embedded rather than forming an obvious armor.
Coloration follows the barred pattern common to many small Schistura: the body carries nine to eleven dark vertical bars along its flanks, and there is a distinct dark spot at the base of the dorsal fin immediately followed by an orange spot — a marking combination used to help distinguish it from closely related, similarly-barred stream loaches in the same river system. Beyond size and this pattern, published morphological detail is limited; this is a species best documented in the original taxonomic description rather than in later general-audience accounts.
Habitat
The species is known from the Xe Kong (Kong River), a Mekong tributary in Laos, where it lives in gravel-to-stone riffles under moderate-to-fast current — classic Nemacheilid stream-loach habitat: shallow, clear, well-oxygenated running water over a coarse bed, rather than still or sluggish water. It is described as benthopelagic and tropical, spending its time on or just above the substrate.
Beyond the type locality and the broader Kong River drainage, there is little published detail on its habitat range or any seasonal movement, and no site-by-site survey data of the kind available for better-studied stream loaches. That narrow, single-river distribution is itself informative: like many Schistura, this appears to be a localized stream endemic rather than a widely distributed species, and the honest position is that its full range and habitat tolerances are not well characterized.
Feeding
FishBase records a trophic level of about 3.0, consistent with a small-organism feeder — a classic Nemacheilid micro-predator that picks small invertebrates, insect larvae and other tiny prey items from among the gravel and stones of its riffle habitat, rather than grazing algae or biofilm in the way many hillstream loaches do. This matches the general feeding pattern of the genus.
No specific dietary study or aquarium feeding account exists for this species in the sources available here, so beyond that general trophic classification, its precise prey preferences are undocumented. Feeding ecology for stream-dwelling Schistura of this type is best inferred from the genus as a whole rather than stated with species-specific certainty.
Mating
No courtship, spawning behavior, or sexual dimorphism has been documented for Schistura nomi in the sources available. This is consistent with the genus generally: most small Schistura are known only from taxonomic survey collections, and reproductive behavior in the wild — let alone in captivity — is rarely observed or published for the great majority of stream-loach species.
Given the total absence of specific data, the honest statement is that mating behavior for this species is undescribed; nothing here should be inferred beyond what is typical for egg-scattering Nemacheilidae in general.
Breeding
Nothing has been published on breeding in Schistura nomi specifically. Stone and brook loaches of this kind are, as a rule, egg-scatterers: ripe adults release eggs over gravel or among stones in fast-flowing water, with no nest, no guarding, and no parental care of any kind — a pattern shared broadly across Nemacheilidae and quite different from the cave-spawning or mouthbrooding strategies seen in other fish groups entirely.
This species is not known to have been bred in the aquarium, and given how narrowly it is documented even in its native range, that is unsurprising; most Schistura are simply never kept or spawned outside their home streams. The fair summary is: presumed egg-scatterer over gravel in fast water, no parental care, and — so far as any source shows — never bred in captivity.
In the aquarium
Schistura nomi is not an established aquarium species, and there is no meaningful hobby literature or trade history to draw on. Should it ever appear in the trade, the general Nemacheilid template would apply: a small, cool-to-moderate, clear, fast-flowing, well-oxygenated stream setup with a gravel-and-stone substrate, strong water movement, and a mature biofilm surface for it to forage over — the opposite of a warm, still, decorative community tank.
As with other near-scaleless Nemacheilidae, any specimen would be expected to be sensitive to copper and to full-strength medications, warranting the same cautious, half-dose approach used with other loaches. Given how little is published about its temperature tolerance or water chemistry preferences specifically, a keeper would need to lean on general stream-loach husbandry and err toward cooler, cleaner, faster-flowing water rather than assume it tolerates warm, still conditions.
Conservation
The IUCN Red List assessed Schistura nomi as Least Concern on 12 January 2011, noting high resilience (a minimum population doubling time under 15 months) and low vulnerability to fishing pressure. That is a reassuring status, though it should be read alongside how little is otherwise published about the species: a Least Concern rating here reflects a lack of documented decline and broad resilience typical of the genus, not necessarily an intensively monitored population.
As a single-river endemic of the Xe Kong in Laos, its long-term outlook is tied to the health of that specific Mekong tributary — water quality, damming, and land-use change in the catchment are the kinds of pressures that matter most for narrow-range stream loaches like this one, even where no specific threat has yet been documented for this species by name.