Actinopterygii (ray-finned fishes) >
Characiformes (Characins) >
Distichodontidae (Distichodus)
Etymology: Nannocharax: Latin, nannus = small + Greek, charax = a marine fish without identification (Ref. 45335); dageti: The species name, dageti, is in honor of the late Dr. Jacques Daget (1919-2009), formerly of the Muséum National d'Histoire Naturelle, Paris, in recognition of his major contributions to our knowledge of African freshwater fishes (Ref. 95523).
Environment / Climate / Range
Ecology
Freshwater; benthopelagic. Tropical, preferred ?
Africa: upper portions of the Congo River, in Kasai, Lualaba and Luapula Rivers (Ref. 95523), and Kafue River, part of Zambezi River basin (Ref. 95523). Based on literature (Ref. 12524, 13337, 94654) it is also known from Upper Zambezi River (Ref. 95523).
Size / Weight / Age
Maturity: Lm ? range ? - ? cm
Max length : 4.4 cm SL male/unsexed; (Ref. 95523)
Short description
Morphology | Morphometrics
Dorsal
spines
(total): 0;
Dorsal
soft rays
(total): 12-16;
Anal
spines: 0;
Anal
soft rays: 9 - 12;
Vertebrae: 38 - 40. Diagnosis: Nannocharax dageti is distinguished from all its congeners except N. angolensis, N. gracilis, N. lineostriatus, N. luapulae, N. macropterus and N. taenia by the colouration pattern of a series of vertically elongated, rounded blotches that overlie a longitudinal midlateral dark stripe but are largely separate dorsally from the saddles extending to the dorsal midline (Ref. 95523). Nannocharax dageti differs from N. gracilis, N. luapulae, N. macropterus and N. taenia by possessing an incompletely pored lateral line vs. completely pored lateral line, and a caudal fin with a symmetrical colouration pattern on the lobes consisting of a dark spot at the base of each caudal-fin lobe not continuous with the dark spot over the base of the middle caudal-fin rays, and a series of dark spots forming a transverse stripe paralleling the distal margin of the fin about one-third the length of the lobe from its tip (Ref. 95523). Nannocharax dageti is distinguished from N. angolensis and N. lineostriatus by possessing 40-43 scales along the longitudinal line including the lateral line, vs. 34-39 in N. angolensis and 34-35 in N. lineostriatus; 36-41 pored scales along the lateral line, vs. 21-33 in N. angolensis and 6-9 in N. lineostriatus; and 38-40 vertebrae, vs. 36 in N. angolensis and 35-36 in N. lineostriatus.
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Jerep, F.C., R.P. Vari and E. Vreven, 2014. Nannocharax dageti, a new distichodontid from the Democratic Republic of the Congo and Zambia (Teleostei: Characiformes). Ichthyol. Explor. Freshwaters 24(4):361-369. (Ref. 95523)
IUCN Red List Status (Ref. 109396)
CITES (Ref. 94142)
Not Evaluated
Threat to humans
Harmless
Human uses
Fisheries:
More information
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningFecundityEggsEgg development
Age/SizeGrowthLength-weightLength-lengthLength-frequenciesMorphometricsMorphologyLarvaeLarval dynamicsRecruitmentAbundance
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
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Estimates of some properties based on models
Phylogenetic diversity index (Ref.
82805): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), based on all LWR estimates for this body shape (Ref.
93245).
Trophic Level (Ref.
69278): 3.1 ±0.4 se; Based on size and trophs of closest relatives
Resilience (Ref.
69278): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref.
59153): Low vulnerability (10 of 100) .
