Taxonomy & naming
Akysis manipurensis was described by S. Arunkumar in 2000, published in the Indian Journal of Fisheries (47:3), based on a holotype (MUMF 3001/1A) and paratypes (MUMF 3001/4A) collected from the Yu River system in Manipur, India. It was originally placed in the genus Laguvia, as Laguvia manipurensis, but a 2007 revision of Akysidae redescribed it into the genus Akysis as part of the A. variegatus species group, and Akysis manipurensis is the name now treated as valid.
The family Akysidae — the stream catfishes or stone catfishes — sits within Siluriformes alongside the related, better-known Sisoridae of Asian hillstreams. The genus name Akysis has no simple classical etymology and functions as an established generic name in the group; the species epithet manipurensis is a straightforward Latin place-name adjective, "of Manipur," after the Indian state where the type locality lies. Because the genus was reshuffled during the 2007 revision, older literature or labels referencing "Laguvia manipurensis" refer to the same fish.
Morphology
Like other Akysis, this is a small, elongate, dorsoventrally flattened catfish with a broad head and a completely naked, scaleless skin rather than bony plates. Maximum reported size is under 3 in standard length, making it one of the smaller members of an already diminutive genus.
The fins carry stiff, serrated spines at the leading edge of the dorsal and pectoral fins that can be locked erect — a feature shared across the family and one reason Akysidae are informally grouped with other spiny, naked-skinned Asian hillstream catfishes as mildly venomous. Barbels ring the mouth for detecting prey by touch in turbid or fast-flowing water, and the low, streamlined profile lets the fish hold position against current and squeeze into narrow gaps between stones.
Habitat
The species is known from the Lairaok Maru stream near Moreh, roughly 68 mi from Imphal City, part of the Yu River system in Manipur, northeastern India, close to the border with Myanmar. This places it in fast-flowing hillstream habitat typical of the eastern Himalayan foothill drainages — clear, well-oxygenated water over a coarse gravel and sand substrate.
As with related Akysis species, this fish is a benthic ambush specialist: it buries itself in coarse sand or gravel during the day with only its eyes exposed above the substrate, emerging to forage as light fades. Specific water chemistry data for this species has not been documented in available sources, but hillstream habitats of this type are typically cool-to-moderate, current-swept, and low in dissolved organic load — conditions very different from a still, planted community tank.
Feeding
Akysis species are nocturnal benthic micropredators, foraging after dark over the stream bed for small aquatic invertebrates — crustaceans, worm-like prey, insect larvae and zooplankton. They are not opportunistic omnivores in the way many larger catfish are; hobbyist accounts of the genus describe them as picky feeders.
In the aquarium, small live or frozen foods offered after lights-out — Artemia, Daphnia, bloodworm and glassworm — are the reported way to get related Akysis feeding reliably. Sinking pellets and prepared foods are generally accepted poorly if at all by this genus, so a keeper should expect to feed live or frozen foods specifically, timed to the fish's nocturnal activity rather than daytime feeding.
Mating
No species-specific account of courtship or spawning behaviour for Akysis manipurensis has been documented in available sources. What is known comes from the closely related A. prashadi, for which spawning has been observed over artificial nylon "egg traps" placed in the aquarium, coinciding with the onset of the rainy season and an associated drop in temperature — suggesting a seasonal trigger tied to monsoon conditions in the wild.
Sexing Akysis is reportedly difficult, without obvious external dimorphism, which compounds the challenge of deliberately pairing fish for breeding attempts. Data for this species specifically is sparse; the genus as a whole is not well studied in captivity.
Breeding
Breeding is not established for Akysis manipurensis and, based on the wider genus, is very difficult to achieve in home aquaria. The one documented captive spawning in a close relative, A. prashadi, produced eggs over nylon egg-traps that proved infertile, with no parental care observed — not a repeatable breeding success, and not evidence of any particular guarding or nesting strategy for the genus.
Given the lack of confirmed spawning behaviour, no reliable protocol exists for this species. Prospective keepers should treat this as a fish that is essentially not bred in captivity at present, with any offspring in the trade very likely wild-collected rather than farm- or hobbyist-bred.
In the aquarium
This is a genuinely tiny catfish — under 3 in — but that small size does not make it an easy community fish. Like other Akysidae it is scaleless, so it is sensitive to copper-based medications and many standard treatments; dose conservatively, as with loaches, puffers and other naked-skinned catfish. It also carries stiff, locking dorsal and pectoral spines that can snag a net, so it is safer to move in a container than to chase with a net.
As a hillstream specialist it wants strong water movement, high dissolved oxygen and a coarse sand or fine gravel substrate it can bury into; still, warm community-tank water is a poor match for its biology. It is strictly nocturnal, spending daylight hours buried with only its eyes showing, so cover and subdued lighting help it settle, and food should be offered after dark. Given its narrow habitat requirements and the scarcity of husbandry information, this is a fish best suited to a dedicated hillstream or biotope setup rather than a general aquarium, and stock should be assumed wild-collected.
Conservation
The IUCN Red List has not published a numeric assessment locatable for Akysis manipurensis; available sources indicate a Data Deficient standing, reflecting how little is documented about its population size, range extent or trend beyond the original description and a handful of taxonomic notes.
The species is known only from a single stream system in Manipur near the Myanmar border, a restricted range that would leave it vulnerable to habitat degradation, pollution or damming if such pressures reached the Yu River system, though no specific threat data has been documented. As with many small, narrow-range Asian hillstream catfishes, the absence of data is itself a conservation concern — too little is known to rule out risk, and any specimens reaching the aquarium trade should be assumed wild-collected from a habitat that has not been well surveyed.