Taxonomy & naming
Cataphractus volans was described by Friedrich Christian Meuschen in 1778, placing it in the now-obsolete genus Cataphractus within the thorny and talking catfish family Doradidae. Cataphractus is a historical genus name no longer in current use — modern taxonomy, following the Catalog of Fishes (Eschmeyer, CAS), places this species complex in the genus Acanthodoras, with Acanthodoras cataphractus (Linnaeus, 1758) as the best-known and best-documented relative. No dedicated modern species account exists under the original 1778 name, so this profile draws on the closely related and taxonomically parallel Acanthodoras cataphractus for the biological detail that is not tied to the historical name itself.
Doradidae, the thorny or talking catfishes, is a large South American family named for the bony armour plates (scutes) that run along the flanks of most species and for the audible sounds many produce by grinding their pectoral spines against the shoulder girdle. Data on Cataphractus volans specifically is sparse; readers should treat size, range and husbandry notes here as inferred from the Acanthodoras group rather than confirmed for this exact name.
Morphology
Doradids in this group have a distinctive squat, tadpole-like body: a large, heavily ossified head tapering to a narrower tail, with three pairs of barbels around the mouth used to feel out food on the substrate. The skin carries rows of bony scutes rather than true scales, giving a plated, armoured look, and — as in essentially all catfish of this kind — there are no true scales, which makes the fish more sensitive to copper and many medications than a scaled fish.
Stiff, serrated, locking spines are present at the leading edge of the dorsal and pectoral fins, a hallmark of the family; these can be locked erect, catch in a net, and jab a careless hand, so this fish is best moved in a container rather than netted. Adult size in the Acanthodoras group runs to about 4.5 in standard length — a genuinely small catfish, but one that should still be sized honestly rather than assumed to stay smaller.
Habitat
The Doradidae as a family is a South American group centred on the Amazon and Orinoco basins, and the closely related Acanthodoras cataphractus is documented from the Amazon basin proper — Bolivia, Brazil, Peru and Colombia — as well as the Guiana Shield drainages of Guyana, Suriname and French Guiana. Cataphractus volans, under its historical name, has no independently documented locality data in the sources consulted here, so its range should be treated as broadly consistent with this Amazon-and-Guianas doradid group rather than pinned to a specific river system.
Water conditions for the group are warm tropical and soft-to-neutral: roughly 72–79 °F, pH 6.0–7.5, soft to moderately hard (4–25 dH). These are blackwater- and clearwater-adjacent lowland conditions typical of Amazonian tributaries, not the harder or more mineral-rich water of other South American systems.
Feeding
This is a nocturnal benthic omnivore. By day it shelters among cover, and after dark it works the substrate with its barbels, taking detritus, small invertebrates and other bottom material — digging into the substrate as it forages rather than simply picking food off the surface.
In the aquarium it should be offered sinking pellets, frozen foods and other prepared foods, ideally given after lights-out so a nocturnal, retiring fish is not out-competed by more active tankmates feeding during the day.
Mating
No courtship or spawning behaviour has been documented for Cataphractus volans under this name, and the sources consulted here do not describe mating behaviour for the closely related Acanthodoras cataphractus either. Doradid breeding modes vary by genus rather than following one family-wide pattern, so no mode should be assumed for this species without direct evidence.
Breeding
Breeding status is unknown in the aquarium for this species. Unlike the armoured callichthyids (Corydoras' relatives), which build male-guarded bubble nests, or the driftwood catfishes, which fertilise internally, the doradids as a group do not have a single well-documented home-aquarium spawning method, and nothing specific has been recorded for Cataphractus volans or its close relative Acanthodoras cataphractus. It should be treated honestly as a species that is not established as captive-bred in the hobby, with any wild or captive offspring reaching the trade by incidental rather than deliberate means.
In the aquarium
Sized at roughly 4.5 in as an adult (based on the closely related Acanthodoras cataphractus), this is a small but not tiny catfish that still needs proper floor space rather than a nano tank — a group of several individuals, as recommended for its Acanthodoras relatives, does best in at least a 36×15×12 inch (roughly 90×38×12 in) footprint. Use a soft sand or smooth gravel substrate to protect the sensitive barbels, and provide driftwood, aquatic plants and other cover; this is a shy, nocturnal fish that needs places to retreat during the day and is most active after dark.
Two care points follow directly from its biology. It is scaleless and plated rather than true-scaled, so it is medication-sensitive — dose copper and many other treatments conservatively, as with loaches, puffers and eels. It also carries stiff, serrated, locking dorsal and pectoral spines that tangle readily in a net and can jab the keeper, so move it in a container instead of netting it. It is not commonly imported and is best suited to a peaceful, soft-to-neutral-water community of similarly sized fish.
Conservation
Cataphractus volans has not been assessed by the IUCN Red List and carries no conservation status (Not Evaluated). The same is true of the modern name Acanthodoras cataphractus, which has likewise not been formally assessed. As an obscure historical name for a small, little-studied Amazonian doradid, its population trend and the pressures it faces are essentially undocumented; readers should not infer either stability or decline from the absence of an assessment.