Taxonomy & naming
Labeobarbus robertsi was described by Banister in 1984. The Catalog of Fishes (Eschmeyer) records the valid combination as Labeobarbus robertsi (Banister, 1984), with the parenthetical authority marking the original description. FishBase lists the species under FishBase ID 54460.
The genus Labeobarbus is a large assemblage of African cyprinids — often called yellowfish or large African barbs — broadly distributed across sub-Saharan river systems. The taxonomy of the group has a complex history, with many species having passed through the old catch-all genera Barbus and Puntius before being assigned to Labeobarbus. The specific epithet robertsi honours the ichthyologist whose name it commemorates; no further etymology is documented in available sources.
No common name in widespread use is recorded for this species in the literature or hobbyist trade.
Morphology
Labeobarbus robertsi is a small species by the standards of its genus. FishBase records a maximum length of 2.5 in standard length (SL) for males and unsexed specimens, making it considerably smaller than many of its congeners. Beyond this size datum, published morphological data for the species are sparse in available sources.
As a member of Labeobarbus, it presumably shares the general body plan of African large barbs — a robust, fusiform to moderately deep-bodied cyprinid with a subterminal mouth suited to benthic feeding. Details of coloration, fin ray counts, and distinguishing characters beyond those in the original description are not documented in accessible secondary literature.
Habitat
The species is known from the Inkski River, a tributary in the lower Congo River basin, Democratic Republic of the Congo. FishBase records it as a freshwater, benthopelagic species of tropical latitudes. The lower Congo basin encompasses some of the most hydrologically dynamic river habitats on Earth, including fast-flowing, deeply oxygenated channels and calmer backwaters over a variety of substrates.
No water-chemistry parameters — temperature, pH, or hardness — are documented specifically for L. robertsi in available sources. The lower Congo is generally warm and its chemistry varies considerably by sub-basin; without locality-specific measurements it would be speculative to assign precise values to this species.
Feeding
No diet data specific to Labeobarbus robertsi are documented in available sources. The broader Labeobarbus genus is characterised by omnivorous to herbivorous feeding strategies, with species recorded taking macrophytes, phytoplankton, algae, detritus, and invertebrates depending on local availability.
Given its small size and benthic lifestyle inferred from the FishBase habit code, L. robertsi likely feeds on small invertebrates, algal films, and organic matter at or near the substrate, as is typical of small African cyprinids in comparable habitats. These generalisations should be treated with caution in the absence of direct dietary study.
Mating
No behavioural or reproductive observations are recorded in available sources for Labeobarbus robertsi specifically. As a cyprinid and member of the barb lineage, it is expected to be an egg-scattering, non-guarding spawner — the universal reproductive mode across the barbs. No nest construction, territoriality, mouthbrooding, or parental care of any kind is known for any member of this lineage.
In related African barbs, spawning is typically seasonal and tied to rainfall and river-level cycles. Males pursue gravid females over the substrate or through aquatic vegetation, with eggs and milt released together in brief spawning runs. The adhesive eggs settle on substrate or vegetation and receive no further attention from either parent.
Breeding
Labeobarbus robertsi has not been bred in captivity to any documented record. Like all barbs, it would be expected to scatter adhesive eggs without parental care; the adults would likely consume eggs given the opportunity, as is typical across the family. Seasonal flood cycles in the Congo basin are the probable natural trigger for spawning in the wild.
In the absence of captive husbandry records, specific breeding parameters — water conditions, clutch size, incubation period, and larval development — cannot be stated. The species is not known in the ornamental trade.
In the aquarium
Labeobarbus robertsi is not a species of the aquarium hobby. It is a little-known, under-surveyed fish from a single river system in the Congo basin, with no trade presence and no captive-husbandry literature. Its small size (2.5 in SL) might in principle make it manageable in a large species tank, but in the absence of any captive records, water-chemistry data, or dietary observations, no meaningful keeping guidance can be provided.
Any interest in this or related Congo basin barbs is best directed toward the scientific literature and specialist ichthyological institutions rather than the aquarium trade.
Conservation
Labeobarbus robertsi is assessed as Data Deficient (DD) on the IUCN Red List, with the assessment dating to 2009. The Data Deficient listing reflects the absence of adequate information on the species' population size, distribution, ecology, and threats — not a judgment that it is necessarily secure.
The species is known only from the Inkski River in the lower Congo basin, a geographically restricted range that could make it vulnerable to localised impacts. The Democratic Republic of the Congo faces ongoing pressures on its freshwater systems from artisanal mining, deforestation, pollution, and infrastructure development. Without dedicated surveys, the current status of L. robertsi in the wild — whether it remains common in its type locality or has declined — is unknown.