Actinopterygii (ray-finned fishes) > Cypriniformes
(Carps) > Cyprinidae
(Minnows or carps) > Labeoninae
Etymology: Labeo: Latin, labeo = one who has large lips (Ref. 45335); nunensis: Named after the River Noun where the type material was collected (Ref. 26190). Considered a synonym of Labeo parvus (Ref. 2801).
Environment: milieu / climate zone / depth range / distribution range
Freshwater; benthopelagic. Tropical; 10°N - 15°S
Africa: Lower Guinea endemic, found in north-western Cameroon in following rivers: Noun, Djerem, Sanaga, Kelle, Mape, Assamba, Mbam, Mekay, Meng, Nchi, Nkoup, Mvi, Mevobo , tributary of Kim and northern Mifi (Ref. 81639). Records of Labeo chariensis from Cameroon may in fact refer to Labeo nunensis.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 29.1 cm SL male/unsexed; (Ref. 26190)
Morphology | Morphometrics
soft rays: 8;
Vertebrae: 32 - 34. Diagnosis: snout very prominent and with a more or less deep transverse furrow and numerous tubercles; some specimens additionally have numerous small, wart-like tubercles dorsally on head; small fleshy appendage at anterior end of snout; interocular profile flattened; scale formula: 38-40 (39 commonly observed); 4.5-6.5 (5.5 commonly observed, exceptionally 4.5); 3.0-4.5 (4.0 commonly observed); 16-19 (16 commonly observed); dorsal fin with 11-12 (11 commonly observed) branched rays; upper edge of dorsal fin falciform (or deeply concave); 33-34 (33 commonly observed) vertebrae; ventral fin origin located under the 4th branched dorsal ray; genital orifice situated distant from anal fin origin; sometimes a dark brown longitudinal band is present (Ref. 81639).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Reid, G.M., 1985. A revision of African species of Labeo (Pisces: Cyprinidae) and a re-definition of the genus. Verlag von J. Cramer, Braunschweig. 322 p. (Ref. 1440)
IUCN Red List Status (Ref. 119314)
CITES (Ref. 115941)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00832 (0.00356 - 0.01943), b=3.09 (2.88 - 3.30), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Resilience (Ref. 69278
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Moderate vulnerability (44 of 100) .