Taxonomy & naming
Neonoemacheilus morehensis was described by Arunkumar in 2000, its species epithet referring to Moreh, the border town in Manipur near the Yu River drainage where the type material was collected. It sits in the genus Neonoemacheilus, one of many genera carved in recent decades out of the old, unwieldy catch-all Noemacheilus/Nemacheilus as ichthyologists worked through the huge diversity of Asian stream loaches.
The family Nemacheilidae — the stone or brook loaches — is by species count the largest loach family, and its generic boundaries have been revised repeatedly as material from small, remote drainages like the Yu River gets described and re-examined. The Catalog of Fishes is the current authority for the valid combination Neonoemacheilus morehensis; no synonymy or generic reassignment is noted here, so the name used at description stands.
Morphology
As a member of Nemacheilidae, Neonoemacheilus morehensis has the family's characteristic build: a small, elongate, sub-cylindrical body suited to holding position on the bed of a fast stream, a flattened head and ventral mouth for grazing and picking food off rock and gravel, and the near-scaleless or very finely scaled skin typical of the group. Like many nemacheilids it likely carries a small, erectile suborbital spine, though this has not been specifically documented for the species in available sources.
Detailed measurements — maximum length, fin-ray counts, colour pattern — are not given in the sources available for this profile. This is typical of small-range Nemacheilidae described from a single river system: the original description covers the diagnostic characters that separate it from related species, but the kind of broad morphological account built up over many collected specimens simply has not been done. Prospective keepers and researchers should treat size and appearance claims for this species with caution until better-documented material is published.
Habitat
Neonoemacheilus morehensis is endemic to the Yu River system in Manipur, northeastern India, a drainage that also flows into Myanmar. Nemacheilidae as a family are upland stream specialists, and the genus's ecology follows that pattern: cool to moderately warm, clear, fast-flowing, well-oxygenated water running over rock, gravel and sand substrates, rather than the warm, still, tannin-stained pools associated with some other tropical Asian fish.
Northeastern India's hill streams are a centre of loach diversity and endemism, and species like this one are frequently known from only one river system. That narrow distribution, combined with the region's remoteness and limited ichthyological survey effort, is a major reason the species remains so poorly documented — there simply has not been the sustained fieldwork to establish population size, seasonal habitat use or fine-scale distribution within the Yu River drainage.
Feeding
Nemacheilid stone loaches are bottom-foraging micro-predators, and Neonoemacheilus morehensis can be expected to follow the family pattern: picking small invertebrates, insect larvae and other stream invertebrates off rocks, gravel and sand in fast-flowing water, supplemented by algae and detritus grazed from the substrate. No species-specific dietary study is available.
In an aquarium setting, stone loaches of this kind generally take small live and frozen foods — bloodworm, daphnia, brine shrimp — along with sinking pellets and wafers, and will graze biofilm and algae off hard surfaces. They tend to ignore food that sits at the surface, so meals need to reach the bottom where the fish actually forages.
Mating
No information on sexing, courtship or spawning behaviour for Neonoemacheilus morehensis is available in the sources consulted for this profile. Nemacheilidae as a family are egg-scattering fish with no parental care, typically spawning over gravel and among stones in fast-flowing water during spring or early summer as temperature and flow conditions shift with seasonal rains.
Given the species' narrow endemic range and lack of study, it is honest to say that its reproductive biology in the wild has not been documented in the literature available here, and nothing is known of any attempt to breed it under aquarium conditions.
Breeding
There are no records of Neonoemacheilus morehensis being bred in the home aquarium. Stone and brook loaches in general are egg-scatterers that release eggs over gravel and among stones in fast, oxygen-rich water, with no parental care of eggs or fry — but they are also among the loaches least often kept or bred by hobbyists, and most Nemacheilidae species remain entirely unbred in captivity.
For this species specifically, the honest position is that breeding data simply does not exist: it is a narrow-range stream endemic that has not, as far as available sources show, entered the aquarium trade or hobbyist breeding literature. Anyone encountering it in a scientific or fieldwork context should assume mode: egg-scatterer over gravel, no parental care, and treat anything more specific as unconfirmed.
In the aquarium
Neonoemacheilus morehensis is not an established aquarium species, and there is no reliable record of it being kept or traded. Any care guidance has to be extrapolated cautiously from its family and habitat rather than from direct experience with the species. Nemacheilid stone loaches from fast hill streams generally need cool-to-moderate, very well-oxygenated, moving water with a hard substrate of rock, gravel and sand and, ideally, a mature biofilm on surfaces to graze; they do poorly in warm, still, low-oxygen setups.
As with most scaleless loaches, caution with copper-based and full-strength medications would be prudent if the species were ever kept, since near-scaleless skin tends to make Nemacheilidae unusually sensitive to treatments tolerated by scaled fish. Given the complete absence of husbandry records, none of this should be read as an endorsement of keeping the species — it is offered only as a reasoned extension of what is known about its relatives, pending real data.
Conservation
Neonoemacheilus morehensis is assessed by the IUCN Red List as Data Deficient, following a 2010 assessment. This reflects its status as a narrow-range endemic of a single river system — the Yu River drainage in Manipur — for which population size, trend and the severity of threats have not been adequately studied. Data Deficient is common among Nemacheilidae stream endemics from remote parts of northeastern India and mainland Southeast Asia, where survey effort lags far behind the diversity being described.
The species is not known to be part of the aquarium trade, so trade pressure is not a documented concern. The more likely long-term risks, typical of small-catchment Himalayan-foothill streams in this region, would be habitat degradation from land-use change, water abstraction and pollution — but without dedicated field surveys, the actual conservation status of Neonoemacheilus morehensis remains genuinely unknown.