Taxonomy & naming
Kottelatlimia katik was described by Maurice Kottelat and Kelvin K. P. Lim in 1992, and the species now anchors the small genus Kottelatlimia, named in Kottelat's own honour alongside Lim's. Older references placed species of this type in the wider genus Lepidocephalichthys, and some hobby literature still uses that combination; the Catalog of Fishes, the standing authority for valid fish names, recognises Kottelatlimia as the correct genus for this species.
It sits within the family Cobitidae, the true spined and pond loaches, a group defined by an erectile spine beneath the eye and a generally elongate, sand-adapted body. Cobitidae has been repeatedly reshuffled by taxonomists over the past few decades, with genera such as Lepidocephalichthys, Acanthophthalmus (now Pangio) and various Nemacheilus-type genera all redrawn; Kottelatlimia katik has kept its current placement through that process.
Morphology
Like other Cobitidae, Kottelatlimia katik carries the erectile suborbital spine that defines the family — a small, hinged spike hidden in a groove below the eye that the fish can flick outward when threatened or handled. Its skin is effectively naked, with only tiny, deeply embedded scales, which makes it — like nearly all loaches — considerably more sensitive to medications and to poor water quality than a typical scaled aquarium fish.
The species is small even by loach standards, reaching a maximum of around 5.5 in standard length, and more typically kept and observed at smaller sizes. Its body is slender and elongate, built for burrowing through and sifting soft substrate rather than for open-water swimming, a shape shared across the Cobitidae's sand-dwelling members.
Habitat
This is a tropical species, not a coldwater one — a point worth stressing given how many of its Cobitidae relatives (the European and Anatolian spined loaches of Cobitis and Sabanejewia, and the dojo or weather loach Misgurnus) are temperate fish suited to unheated tanks or ponds. Kottelatlimia katik comes instead from warm lowland Malaysia, known from the area around Penang on the Malay Peninsula.
It inhabits muddy substrates in slow-moving, shallow water — canals, floodplains and similar quiet, soft-bottomed habitats rather than fast hillstream flow. This kind of habitat is easily lost or degraded by drainage and land conversion, which is the main pressure on range-restricted lowland loaches of this type across Southeast Asia.
Feeding
Kottelatlimia katik is a sand-sifting benthic omnivore, foraging through soft mud and sediment for small invertebrates and organic matter, in keeping with the general feeding pattern of Cobitidae. A soft substrate is needed for this natural sifting behaviour to be expressed at all; on gravel or bare glass this kind of loach cannot forage normally.
In the aquarium it accepts flake and sinking pellets alongside live or frozen foods such as mosquito larvae, brine shrimp and Daphnia. As with most bottom-feeding loaches, food needs to reach the substrate where the fish actually forages, rather than being consumed entirely by faster mid-water tankmates.
Mating
No courtship or spawning behaviour has been documented for Kottelatlimia katik in the aquarium, and the species is seldom even exported, so there is little direct observation to draw on. Sexual dimorphism has not been established for this species in the available sources.
What can be said follows from its family: Cobitidae spined loaches generally scatter adhesive eggs among plants, typically around spring in the temperate members of the family. For a tropical lowland species like this one, breeding — if it occurs at all in captivity — would be expected to follow a similar egg-scattering pattern rather than any form of pairing, cave-guarding or mouthbrooding, none of which occur in this family.
Breeding
There is no documented aquarium breeding for Kottelatlimia katik. Among its Cobitidae relatives, several temperate species — Cobitis, Sabanejewia, and the dojo or weather loach Misgurnus — have been pond- or tank-spawned, scattering adhesive eggs among plants in spring. The tropical members of the family, including the horseface loach Acantopsis and Lepidocephalichthys species that Kottelatlimia was once grouped with, generally have not been bred at home, and Kottelatlimia katik fits that pattern.
As an egg-scatterer by family behaviour, any spawning would involve no parental care whatsoever — eggs released among vegetation and left to develop unattended. Given how rarely this species even reaches the trade, hobbyist breeding reports are effectively absent, and a keeper should not expect to breed it.
In the aquarium
Kottelatlimia katik is rarely available and best suited to specialist keepers rather than general community stock. It should be given a soft substrate for natural sifting behaviour, plenty of hiding places, and good filtration to keep its muddy-water native habitat's water quality replicated cleanly at aquarium scale; Loaches Online recommends keeping it in a group of three or more, consistent with the social habits typical of small Cobitidae.
Being near-scaleless like other true loaches, it is sensitive to copper and to full-strength doses of many medications, so any treatment should be approached cautiously and at reduced strength. At a modest maximum size of around 5.5 in, it does not need a particularly large tank, but its specific substrate and water-quality needs make it a considered purchase rather than an impulse buy.
Conservation
Kottelatlimia katik is listed as Least Concern by the IUCN Red List, assessed on 4 January 2019. It is range-restricted to the Malay Peninsula around Penang but was found to be stable in suitable habitat at the time of assessment.
Its reliance on muddy, slow-moving lowland waters such as canals and floodplains means it is nonetheless exposed to the general pressures facing that habitat type in developed parts of Malaysia — drainage, canalisation and land conversion. It is seldom collected for the aquarium trade, so trade pressure is not considered a factor in its status.