Taxonomy & naming
Schistura procera was described by the Swiss ichthyologist Maurice Kottelat in 2000, placed directly in the genus Schistura within the family Nemacheilidae, the stone and brook loaches. Nemacheilidae is the largest of the loach families and has been heavily reshuffled over the past few decades as older catch-all genera such as Nemacheilus and Noemacheilus were split apart; Schistura is one of the genera that absorbed much of that diversity and remains the valid combination for this species per the Catalog of Fishes, the authority for valid names.
The species epithet procera comes from the Latin procerus, meaning elongate or tall, a likely reference to the fish's slender body shape. It shares its home drainage with other Schistura, including the similarly Nam Ou-associated Schistura kengtungensis, and is reported alongside the algae-grazing hillstream genus Garra (Garra cambodgiensis) in its native creeks.
Morphology
Schistura procera is a small loach, reported to reach about 3.5 in in standard length. As with other members of its genus it is an elongate, cylindrical fish built for holding position in current, with a ventrally flattened head and body suited to a life spent hugging the streambed. Detailed morphological description beyond the type material and size data is not available from the sources consulted here, so finer points of colour pattern and fin structure are left undescribed rather than guessed at.
Like other nemacheilids, Schistura species typically carry the small, embedded scales and generally scaleless-feeling skin characteristic of the group, a trait that matters for handling and medication even where it has not been explicitly documented for this species.
Habitat
This species is known only from the Nam Ou basin in Laos, a tributary system of the Mekong. Its recorded habitat is small forest creeks of at most about a metre wide and 2–4 in deep, running with low flow over a pebble substrate — the kind of shaded, narrow headwater stream typical of many range-restricted Schistura. It is described as benthopelagic, meaning it spends its time near the bottom but moves up into the water column as it forages, in tropical freshwater.
This is a warm, tropical stream habitat rather than a cool highland torrent — the type locality sits in low-flow forest creeks, not the cold, fast hillstream torrents associated with high-altitude relatives such as Triplophysa. Water chemistry data (pH, hardness) was not available in the sources consulted.
Feeding
No dedicated dietary study of Schistura procera was found. As a small benthopelagic nemacheilid loach of shaded forest creeks, it most likely forages as a micro-predator, picking small invertebrates — insect larvae and other tiny bottom-dwelling prey — from among the pebbles and leaf litter, in keeping with the general feeding pattern of Schistura and other stone loaches.
In the absence of specific data for this species, keepers should assume the conservative approach typical of small Schistura: small sinking live, frozen and prepared foods offered at the bottom, rather than surface flake, which this benthic fish is unlikely to take reliably.
Mating
No information on courtship, sexual dimorphism or spawning behaviour for Schistura procera was found in the sources consulted. This is common among range-restricted Schistura known mainly from type material and museum records; the species has not been documented in the aquarium trade or studied for reproductive biology.
Breeding
There is no record of Schistura procera being bred in the aquarium, and no wild reproductive data is available either. In line with the general pattern for stone and brook loaches (Nemacheilidae), the most likely mode is egg-scattering over gravel or among stones in flowing water, with no parental care — but this should be read as an inference from the family's typical biology rather than a documented fact for this species. Data here is genuinely sparse, and it should be treated as rarely or never bred in captivity.
In the aquarium
Schistura procera does not appear to be established in the aquarium trade, and no husbandry accounts were found in the sources consulted. Any keeper attempting it should extrapolate cautiously from its wild habitat: a small, narrow forest creek with low flow over pebbles suggests a modestly sized tank with a fine gravel or pebble substrate, moderate warm-water temperatures, and clean, well-oxygenated conditions rather than a large river-torrent setup.
As with other small, likely near-scaleless nemacheilids, caution with medications and copper-based treatments is a sensible default even without species-specific confirmation. Given how little is documented about this species outside its type description, it should be regarded as a fish for specialists working from wild-collected or research material rather than a trade staple.
Conservation
Schistura procera is assessed by the IUCN Red List as Least Concern. As a species known from a restricted stream system in the Nam Ou basin of Laos, its status should nonetheless be watched, since narrow-range stream endemics of this kind are vulnerable to localised pressures such as deforestation, damming and water quality changes even when not currently classified as threatened. No specific information on trade collection for this species was found.