Actinopterygii (ray-finned fishes) > Clupeiformes
(Herrings) > Clupeidae
(Herrings, shads, sardines, menhadens) > Dorosomatinae
Etymology: Thrattidion: Diminutive of Greek, thratta, -es = a kind of fish (Ref. 45335). More on author: Roberts.
Environment: milieu / climate zone / depth range / distribution range
Freshwater; pelagic. Tropical; 6°N - 3°N
Africa: endemic to the Sanaga River at Edea, Cameroon (Ref. 188, 28136, 81631).
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 2.1 cm SL male/unsexed; (Ref. 188)
soft rays: 23 - 25. Diagnosis: Thrattidion noctivagus is distinguished from its congeners by the following characters: posterior supra-maxilla absent, belly rounded; prepelvic scutes 4 to 7, with lateral arms, but without keels; pelvic scute with 2 or 3 lateral arms; postpelvic scutes keeled and with arms; lower gillrakers 10 or 11; pelvic insertion well before dorsal fin, with 7 or 8 finrays; anal fin beginning under dorsal fin base (Ref. 188, 81631). The presence of scutes distinguishes it from Congothrissa gossei and the absence of a second supra-maxilla distinguishes it from all other West or central African pellonulines (Ref. 188).
Found in rivers, collected only at dusk and dawn in swiftly flowing water of about 1m just above the hydro-electric dam at Edea, Cameroon (Ref. 188). Feeds on plankton and some terrestrial insects (Ref. 188).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Teugels, G.G., 2007. Clupeidae. p. 186-204. In M.L.J. Stiassny, G.G. Teugels and C.D. Hopkins (eds.) The fresh and brackish water fishes of Lower Guinea, West-Central Africa. Volume I. Collection Faune et Flore tropicales 42. Institut de Recherche pour le Développement, Paris, France, Muséum National d’Histoire Naturelle, Paris, France, and Musée Royal de l’Afrique Centrale, Tervuren, Belgium. 800 pp. (Ref. 81631)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
Fisheries: of no interest
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00933 (0.00449 - 0.01939), b=3.05 (2.88 - 3.22), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.3 ±0.42 se; Based on food items.
Resilience (Ref. 120179
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .