Taxonomy & naming
Boulenger described the species in 1899. The type locality is Stanley Pool, now Malebo Pool, on the lower Congo River near Kinshasa. Labeo is a large genus of labeonine cyprinids with a ventral, fringed mouth used to scrape algae and detritus from hard surfaces, found in Africa and Asia.
Morphology
A Labeo with a round, ventral mouth, as the name cyclorhynchus (round snout) says. FishBase gives a maximum of 6.5 in TL; colour has not been described in the sources the atlas uses.
Habitat
It lives in the lower Congo River and Malebo Pool region, and FishBase gives the range as the lower and middle Congo basin in the Democratic Republic of the Congo and the Central African Republic, plus the Ogowe River in Gabon. It lives in tropical water at 70–81 °F. Other water parameters have not been published.
Feeding
Labeo graze algae, periphyton and detritus from rocks, wood and the bottom, and take some plant matter and small invertebrates. The diet of this species has not been described separately.
Mating
Mating has not been described for this species. Labeo are generally seasonal egg-scatterers that move to flooded areas or rapids to spawn.
Breeding
Breeding in captivity has not been documented. Large Labeo used in aquaculture are spawned with hormones.
In the aquarium
A long tank with flow and hard surfaces to graze suits a Labeo of this kind, with a tight lid and a temperature within the 70–81 °F range. Care notes come from the genus.
Conservation
The IUCN Red List category is Least Concern, assessed in 2009. Threats have not been described.