Taxonomy & naming
Schistura pumatensis was described by Nguyen and Nguyen in 2007. It sits in the genus Schistura, part of the family Nemacheilidae — the stone or brook loaches, by far the largest loach family and one that has absorbed a great many species formerly scattered across the old, now-obsolete catch-all genera Nemacheilus and Noemacheilus. No older generic combination for this particular species turns up in the available record, so it appears to have been described directly into Schistura rather than transferred in from an earlier name.
FishBase and related aggregators (iNaturalist, Wikidata) confirm the placement and spelling, but none carry a type-locality description, a diagnosis, or an etymology for the specific epithet pumatensis, which most likely references a place name tied to the type locality in Vietnam. Beyond confirming the name is valid and current, there is little more to say — this is a genuinely obscure, recently-described stream endemic.
Morphology
No size or morphological description was located for Schistura pumatensis in the available sources — FishBase lists its length as unrecorded. What can be said comes from the genus: Schistura are small, elongate, near-scaleless stone loaches with a flattened belly suited to gripping the substrate in fast water, and most carry the erectile suborbital spine typical of the wider Cobitoidea, tucked in a groove beneath the eye and flicked out defensively when handled.
The near-absence of scales that defines the genus also means this species is very likely sensitive to copper and to full-strength medications, the same way its better-documented relatives are — a point worth carrying into the aquarium even without a species-specific study to confirm it. Beyond that genus-level profile, any claim about this species' exact size, colour pattern or fin count would be guessing; the data simply is not published.
Habitat
Schistura pumatensis is known only from Vietnam, and FishBase records it as a freshwater, demersal, tropical species — a bottom-dweller of fresh water rather than a brackish or marine one. No type-locality stream, elevation or specific catchment is documented in the sources available here, and the species appears to be narrowly endemic to whatever stream system it was collected from.
Genus-wide, Schistura are stream loaches of clear, fast-flowing, well-oxygenated water across tropical and subtropical Asia, typically over gravel, sand or rock substrate. It is reasonable to expect S. pumatensis follows that pattern, but without a published habitat account for this species specifically, that remains an inference from the genus rather than a documented fact.
Feeding
No diet study exists for this species. Schistura as a genus are micro-predators, working the stream bed for small invertebrates — insect larvae, worms and tiny crustaceans — and FishBase assigns S. pumatensis a mid-level trophic position (around 3.0) consistent with that kind of invertebrate-feeding lifestyle rather than herbivory or detritivory.
In practice, a fish of this build in an aquarium would be expected to take small live and frozen foods such as bloodworm and brine shrimp readily, and sinking pellets less enthusiastically, but this is drawn from genus-wide keeping experience rather than any record for the species itself.
Mating
There is no documented information on sexual dimorphism, courtship or spawning behaviour for Schistura pumatensis. No study of wild reproduction, and no aquarium account of pairing or spawning, was found in any of the available sources.
Across Nemacheilidae generally, stone and brook loaches are not known for elaborate courtship; ripe fish typically pair or group loosely over gravel in fast water ahead of scattering eggs, without nest-building or extended pair bonding. Whether that pattern holds for this species specifically is simply unknown.
Breeding
Schistura pumatensis has no known captive-breeding record. Genus-wide, stone and brook loaches are egg-scatterers: ripe fish release eggs over gravel or among stones in fast-flowing water, with no parental care given afterward, and only a small handful of Nemacheilidae species have ever been deliberately spawned in captivity.
Given the total absence of species-specific breeding data, the honest expectation is that S. pumatensis has rarely or never been bred in a home aquarium. Any keeper attempting it would be working from genus-level principles — cool, high-flow, well-oxygenated water and a gravel substrate — rather than any established protocol for this fish.
In the aquarium
Schistura pumatensis does not appear to be an established aquarium fish — no hobbyist care sheet, retailer listing or keeping account was found for it, and it should be treated as effectively unavailable and undocumented in the trade. Anyone who does encounter it should default to genus-level care: a cool-to-mild tropical stream setup with strong flow, high dissolved oxygen, a fine gravel or sand substrate, and smooth stones or wood to grip and hide among.
As with other near-scaleless loaches, caution with medication is warranted even without a species-specific record — copper-based treatments and full-strength doses of general medications are best avoided or halved. Given the total lack of published size or temperament data, a keeper should size any tank conservatively and monitor the fish closely rather than assume it behaves exactly like its better-known relatives.
Conservation
The IUCN Red List assessed Schistura pumatensis as Data Deficient on 16 June 2010, and FishBase records the same status. Data Deficient reflects a genuine absence of population, distribution and threat information rather than any evidence the species is secure or declining — for a narrowly endemic Vietnamese stream loach known from limited collections, this is an honest and unsurprising rating.
No information on trade, collection pressure or specific habitat threats for this species was located. Vietnamese montane and lowland streams broadly face pressure from damming, deforestation, agricultural runoff and urbanization, and any narrowly endemic stream fish in the region is plausibly vulnerable to those pressures, but no source here documents such threats for S. pumatensis specifically — that connection is inference, not established fact.