Taxonomy & naming
Akysis scorteus was described in 2007 by Lawrence M. Page, Renny K. Hadiaty and J. Andrés López, part of a wave of new Akysis descriptions from Sundaland streams in the 2000s. It belongs to the family Akysidae — the stream catfishes — within the order Siluriformes, a family restricted to South and Southeast Asian hillstreams and closely related to the sisorid catfishes. The genus Akysis is large and still being resolved taxonomically, with many superficially similar small species distinguished mainly by fin-spine serration counts, barbel proportions and colour pattern; the Catalog of Fishes treats Akysis scorteus as the valid combination, and it has not been placed in any other genus historically.
The species epithet scorteus is Latin for "leathery" or "made of hide", a direct reference to the smooth, scaleless skin texture shared by all members of the genus. As with many recently described akysids, the species is known from a restricted type locality and has not accumulated a vernacular or trade name — it is essentially unknown outside the ichthyological literature and specialist collector circles.
Morphology
Akysis scorteus is a minute catfish, reaching only about 1.5 in standard length — smaller than many tetras and among the smallest catfish species recorded anywhere. It shares the characteristic akysid body plan: a flattened head, a slender body tapering to the tail, barbels around the mouth for feeling out food on the stream bed, and a completely scaleless, leathery skin (the trait its name refers to).
Like other members of the genus it carries a dorsal spine and a pectoral spine, each armed with small serrae (FishBase records three small serrae on the pectoral spine) — these lock rigid and can catch in a net or graze skin, though the species is not considered dangerous to keepers. Because the skin is naked rather than plated or scaled, this is a medication-sensitive fish in the same category as loaches and larger scaleless catfish, even though its size makes that easy to overlook.
Habitat
The species is endemic to the Way Seputih river system in Sumatra, Indonesia, and as far as has been documented is not known from anywhere else. It lives in clear-flowing river habitat over sand and gravel substrate, in a channel reported to average around 30 metres wide — a moderate lowland-to-midland Sumatran stream rather than a torrent.
Specific water chemistry (temperature, pH, hardness) has not been documented for this species in the sources available. Given the general pattern for Sundaland stream akysids, warm, well-oxygenated, flowing freshwater is a reasonable expectation, but no measured figures should be assumed — this is flagged as data-sparse rather than filled in with a generic blackwater guess.
Feeding
No feeding data specific to Akysis scorteus has been published. Akysis as a genus are nocturnal benthic micropredators: they forage low over the substrate, mostly after dark, taking small invertebrates such as insect larvae, worms and tiny crustaceans that they locate with their barbels.
In an aquarium setting, akysids in general are reported to take live and frozen foods readily — Artemia, Daphnia, bloodworm and glassworm — and are best fed after lights-out so a shy, nocturnal fish this small is not out-competed by more active tankmates. Whether A. scorteus specifically has been kept and fed in captivity is not documented, so this follows genus-level pattern rather than direct observation of the species.
Mating
No courtship or spawning behaviour has been documented for Akysis scorteus. Small stream akysids are generally believed to be egg-scatterers with no nest and no parental investment beyond releasing eggs into the flow or over the substrate, but this has not been confirmed for this species specifically, and it should not be treated as an established fact for A. scorteus.
Breeding
There are no documented aquarium breeding records for Akysis scorteus. Genus-level accounts describe Akysis as egg-scatterers with no parental care, but that pattern has not been verified in this species, and given how little is published about it in captivity, breeding should be considered essentially unachieved (or at least unreported) in the hobby. Anyone attempting it would be working from genus inference, not species-specific evidence — worth stating plainly rather than dressing it up as settled biology.
In the aquarium
Akysis scorteus is vanishingly rare in the hobby and effectively undocumented as an aquarium fish — most of what can be said here is inference from its biology rather than lived keeper experience. At a maximum size of only 1.5 in SL it needs no more than a small, well-filtered tank, but it should still be given a flowing, well-oxygenated setup with a sand or fine-gravel bottom and plenty of cover to mimic its native clear-stream habitat, since it is naturally shy and largely nocturnal.
Two care points follow directly from its biology and apply regardless of how little else is known. First, like all akysids it is scaleless, so it should be treated as medication-sensitive — dose copper and many standard treatments conservatively, as with loaches and other naked-skinned catfish. Second, it carries small, serrated, locking dorsal and pectoral spines that can snag in a net; move it in a container rather than netting it. Given its tiny size and restricted natural range, this is a specialist's fish, not a species to expect from general retail.
Conservation
The IUCN Red List assesses Akysis scorteus as Data Deficient, reflecting how little is known about its population size, trend or the pressures it faces. It is a single-river endemic, restricted to the Way Seputih system in Sumatra, which by itself makes it vulnerable to any localised habitat degradation, siltation or water-quality change even though no specific threat has been formally documented.
As with many small, recently described Sundaland stream fishes, the absence of data is not evidence of safety — Sumatra's lowland and midland rivers face ongoing pressure from agriculture, deforestation and development, and a species with this narrow a range warrants caution rather than assumption of security.