Taxonomy & naming
Schistura desmotes was described by the American ichthyologist Henry Weed Fowler in 1934, hence the parentheses around his name, which signal that the species has since been moved from its original genus into the modern Schistura. It belongs to Nemacheilidae, the stone or brook loaches, the largest family in the loach superfamily Cobitoidea and one that has been repeatedly reshuffled as older catch-all genera such as Nemacheilus and Noemacheilus were split apart. The Catalog of Fishes, the standing authority for valid fish names, places this species in Schistura, and that combination is used here.
The specific epithet desmotes comes from the Greek for "prisoner" or "one in bonds," a reference to the seven to nine dark, bar-like transverse bands crossing the body — the fish appears to wear prison stripes. Species-level information on S. desmotes beyond its original description and a FishBase summary is sparse; it has not attracted the dedicated hobbyist or scientific attention given to some of its more widely traded relatives.
Morphology
Schistura desmotes is a small, elongate stone loach, reported to reach about 2.5 in standard length at maximum. Like other members of Nemacheilidae it has a slender, rounded-to-slightly-compressed body built for holding position against current, a flattened underside, and paired barbels around the mouth used to feel out food on the streambed. The most obvious field mark is the seven to nine dark transverse bands running down the body, which give the species its name.
As in other Schistura, the skin carries small, deeply embedded scales rather than the fully naked skin of some botiid loaches, but the family as a whole is scale-reduced compared with most other freshwater fishes, and stone loaches share the group-wide sensitivity to disease and medication that comes with that. Nemacheilids in this genus also typically carry a small erectile spine below the eye, though it is far less developed than the prominent suborbital spine of the larger botiid loaches.
Habitat
The species is native to the Chao Phraya and Mae Khlong river basins, draining central Thailand and extending into Malaysia. It lives in fast-flowing streams over stony substrate, at shallow depths of roughly 0.5–27.5 in, in habitat typically carrying patches of algae and the aquatic plant Cryptocoryne along the margins — a classic clear-water, well-oxygenated stone-loach setting rather than a still or blackwater one.
As a benthopelagic fish of running water, S. desmotes needs current, oxygen and a stony or gravel bottom rather than soft sediment. Detailed water-chemistry data for the species itself has not been published, but the habitat description is consistent with the cool-to-moderate, clear, fast-flowing streams favoured by its Schistura relatives in the same region, and keepers should not default to warm, still or heavily tannin-stained water for this fish.
Feeding
Schistura desmotes is a benthic micro-predator, foraging over the stream bottom for small invertebrates — insect larvae, small crustaceans and other invertebrate prey typical of fast, clear, stony streams. Its barbels let it locate food by touch and taste among gravel and algae-covered stones rather than relying on sight alone.
No specific aquarium feeding data has been published for this species, but based on the genus and its natural diet it should take small live and frozen foods such as bloodworm and brine shrimp readily, along with sinking pellets formulated for bottom-feeders; it is unlikely to show much interest in flake left to float on the surface.
Mating
No specific information on sexing, courtship or spawning behaviour has been published for Schistura desmotes. Data on reproduction in this species is sparse, which is typical for a narrow-range Southeast Asian stream loach that has drawn little targeted study.
Based on the reproductive pattern documented across Nemacheilidae generally, stone and brook loaches are egg-scatterers that release eggs over gravel or among stones in flowing water, without pairing behaviour or nest-building comparable to substrate-spawning cichlids. There is no evidence for anything resembling cave-guarding or mouthbrooding in this genus, and none should be assumed here.
Breeding
As with most Nemacheilidae, Schistura desmotes is presumed to be an egg-scatterer, broadcasting eggs over gravel and among stones in fast-flowing water with no parental care afterward. This pattern is well documented across the family, though it has not been specifically confirmed for this species.
S. desmotes is rarely if ever bred in the home aquarium, and no aquarium spawning reports have been located. This is the honest picture for the great majority of stone and brook loaches: they are collected from the wild for the trade rather than propagated in captivity, and a keeper should not expect to breed this species at home.
In the aquarium
Schistura desmotes is not a widely established aquarium fish, and dedicated care information is limited. What can be said with confidence follows from its family and habitat: it is a small (under 3 in), active bottom-dweller that needs cool-to-moderate, clean, well-oxygenated water with real current and a stony or gravel substrate rather than soft mud or heavy planting. A tank that mimics a shallow, fast-flowing stream — strong filtration output, smooth stones, and some algae growth or biofilm on hard surfaces for it to graze and forage over — suits the genus far better than a warm, still community tank.
Being a near-scaleless nemacheilid, it should be treated with the same caution given to other stone loaches when it comes to medication: copper-based and full-strength treatments are best avoided or halved, since scale-reduced loaches absorb such compounds readily. Given how little is documented about this particular species, keepers taking it on should treat it as a specialist stream fish and lean on the general Schistura/Nemacheilidae care profile rather than assuming it will tolerate typical warm community conditions.
Conservation
Schistura desmotes is assessed by FishBase as Least Concern, based on an assessment dated 2011; a direct IUCN Red List record for the species was not accessible at the time of writing, so this status should be treated as reported via FishBase rather than confirmed against the primary IUCN listing. The species is known from the Chao Phraya and Mae Khlong basins of Thailand and Malaysia, a wide and heavily used river system.
As with many small-bodied stream loaches, the principal long-term pressures on its habitat are likely to be the general threats facing Southeast Asian rivers — damming, water extraction, pollution and land-use change in the Chao Phraya and Mae Khlong catchments — rather than any documented pressure from the aquarium trade, which does not appear to move this species in significant volume.