Taxonomy & naming
Oxynoemacheilus atili was formally described by the Turkish ichthyologist Fahrettin Erk'akan in 2012, and the Catalog of Fishes — the standing authority for valid fish names — recognizes it as a valid species in the genus Oxynoemacheilus, family Nemacheilidae. The genus itself is a relatively recent split from the old, catch-all Nemacheilus/Noemacheilus complex that once absorbed most of Eurasia's stone loaches; Oxynoemacheilus now holds a large radiation of species native to Anatolia, the Levant and the wider Middle East.
The species epithet honours Ahmet Tuncay Atil. A subsequent Zootaxa revision of the closely related Oxynoemacheilus angorae species group has raised the possibility that O. atili may prove to be a synonym of O. eregliensis, but that later reassessment has not (as of the most recent Catalog of Fishes listing available here) displaced its status as a distinct, described species, and this article treats it as such, following the original 2012 description and the current catalog entry.
Morphology
This is a small, slender stone loach, reported to reach about 3.5 in in total length — modest even by the standards of Nemacheilidae, and smaller than many of its Anatolian relatives. FishBase's description notes an elongated body typical of the genus, with 10 dorsal soft rays and 8 anal soft rays; the fine details of its colour pattern and scale arrangement are what separate it from closely related congeners in the angorae group, which is otherwise a taxonomically tight and easily confused cluster of Anatolian stone loaches.
Like other nemacheilids, O. atili is a bottom-dwelling fish built for gripping and grazing along stream substrate rather than for open swimming, and — as in most stone and brook loaches — the skin carries very small, embedded scales, leaving it functionally near-scaleless and correspondingly sensitive to harsh chemical treatment. Beyond the diagnostic fin-ray counts and the general nemacheilid body plan, no further published morphological detail was found in the sources consulted for this profile.
Habitat
Oxynoemacheilus atili is endemic to a narrow slice of Turkey: the drainage of Lake Beyşehir in central Anatolia, plus the separate Manavgat basin that drains south to the Mediterranean. Its type locality is given as Lake Beyşehir itself and the Eflatun pınarı — a named spring — in western Turkey, and FishBase classifies it as a demersal, subtropical freshwater fish, meaning it lives on or near the bottom rather than in open water.
The waters of this region are the classic Anatolian stone-loach habitat: cold-to-cool, clear, well-oxygenated streams and spring-fed waters draining karstic limestone country, a world away from the warm, still, tannin-stained rivers that many South American and Southeast Asian aquarium fish come from. No specific published temperature or pH readings for this species were found in the sources consulted here, so those figures are left honestly blank rather than guessed at; keepers and researchers should assume the cool, fast, clean-water profile typical of the genus and its Anatolian relatives until better data surfaces.
Feeding
No species-specific dietary study was found in the sources consulted for this profile. As with the great majority of small nemacheilid stone loaches, O. atili is almost certainly a benthic micro-predator, picking small aquatic invertebrates — insect larvae, worms and tiny crustaceans — off the streambed and among gravel and stones, in the manner well documented for its Oxynoemacheilus and Barbatula relatives across Anatolia and the Middle East.
In the near-total absence of the species from the aquarium trade, there is no hobby feeding record to draw on. Where any related stone loach is kept, it typically takes small live and frozen foods (bloodworm, daphnia, brine shrimp) and sinking pellets readily, but may ignore flake that stays at the surface; that general pattern is offered here as a reasonable inference from the genus rather than as a verified fact for this species.
Mating
No published account of courtship or spawning behaviour in Oxynoemacheilus atili was found in the sources consulted here. Stone and brook loaches in Nemacheilidae are, as a rule, egg-scattering fish with no pair-bonding and no nest-building, and there is nothing in the available material to suggest this species departs from that pattern. Beyond that general expectation for the family, the mating biology of this narrow Anatolian endemic must be honestly recorded as unstudied or unpublished.
Breeding
Nothing has been published on captive or wild breeding for this species in the sources reviewed here, and it is not a species that is deliberately kept or bred by aquarists. Based on the well-documented pattern across Nemacheilidae, the expected mode is an egg-scatterer: females broadcast eggs over gravel and among stones in fast-flowing water, with no parental care of eggs or fry afterward. Stone and brook loaches of this kind are rarely if ever bred in home aquaria, and O. atili — a narrow-range endemic essentially absent from the trade — is certainly no exception; there is no aquarium-breeding record to report.
In the aquarium
Oxynoemacheilus atili is not established in the aquarium hobby, and no husbandry account for it was found in the sources consulted for this profile. It should not be assumed to be available or suitable for the trade: as a single-basin Turkish endemic already flagged as Near Threatened, any collection pressure carries real conservation weight, and this species has no place being taken from the wild for aquarium sale.
Were it ever to be kept responsibly — for research or conservation-breeding purposes rather than the ornamental trade — the sensible starting point would follow the general Nemacheilidae playbook: cool, clean, fast-flowing, well-oxygenated water over a gravel or stone substrate, since this is a cold-stream specialist, not a warm, still-water fish. As with other small, near-scaleless stone loaches, any medication should be approached cautiously and at reduced strength. This profile deliberately stops short of prescribing detailed tank parameters that are not supported by the available sources.
Conservation
Oxynoemacheilus atili is assessed as Near Threatened on the IUCN Red List, an assessment dated 25 January 2013. Its entire known range is confined to the Lake Beyşehir drainage and the adjoining Manavgat basin in western and central Anatolia — a single lake system and one neighbouring Mediterranean-draining basin — which is precisely the kind of narrow, single-catchment endemism that makes Anatolian stone loaches vulnerable to any local disturbance of water quality, abstraction or habitat change.
As a species with no established aquarium trade, its conservation pressures are not ornamental-collection driven; they are the broader threats common to small-range Anatolian freshwater endemics, such as water abstraction, pollution and habitat alteration in and around Lake Beyşehir. The taxonomic uncertainty noted above — the possibility that it may eventually be synonymized with O. eregliensis — is itself a reminder of how poorly resolved and understudied this whole regional radiation of stone loaches remains.