Klassifizierung / Names
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Characiformes (Characins) >
Distichodontidae (Distichodus)
Etymology: Nannocharax: Latin, nannus = small + Greek, charax = a marine fish without identification (Ref. 45335); signifer: The Latin word signifer meaning 'colour sergeant' or 'standard bearer' refers to the unusual red-orange colour on the dorsal fin; a noun in apposition (Ref. 85591).
Umwelt: Milieu / Klimazone / Tiefenbereich / Verbreitungsgebiet
Ökologie
; süßwasser pelagisch; pH range: 7.0 - 7.4. Tropical; 28°C - 29°C (Ref. 85591)
Africa: Ouémé River basin in Benin (Ref. 85591).
Größe / Gewicht / Alter
Geschlechtsreife: Lm ?  range ? - ? cm
Max length : 5.7 cm SL Männchen/unbestimmt; (Ref. 85591)
Kurzbeschreibung
Bestimmungsschlüssel | Morphologie | Morphometrie
Rückenflossenstacheln (insgesamt) : 0; Rückenflossenweichstrahlen (insgesamt) : 12 - 14; Afterflossenstacheln: 0; Afterflossenweichstrahlen: 10 - 11; Wirbelzahl: 38 - 39. Diagnosis: Nannocharax signifer is distinguished from all other Nannocharax species in West Africa by the red-orange colouration of the anterior part of its dorsal fin (Ref. 85591). The combination of the following characters is also diagnostic: no continuous black band along the flank; multiple x-shaped body colour pattern extending on the lower half of the flank; 46-48 lateral line scales; and 4-5 scales between anus and origin of anal fin (Ref. 85591).
Body shape (shape guide): elongated; Cross section: oval.
Found in a narrow forest stream with dense vegetation on its banks and with bottom substrate of mud, sand, leaves, roots and drift wood; also found in larger streams with only spare vegetation in the form of small bushes and solitary trees and with bottom substrate consisting mainly of sand and gravel (Ref. 85591).
Lebenszyklus und Paarungsverhalten
Geschlechtsreife | Fortpflanzung | Ablaichen | Eier | Fruchtbarkeit | Larven
Moritz, T., 2009. Nannocharax signifer, a new species of fish (Characiformes: Distichodontidae) from the Ouémé River basin, Benin. Ichthyol. Explor. Freshwat. 20(4):289-294. (Ref. 85591)
IUCN Rote Liste Status (Ref. 130435: Version 2025-2 (Global))
Bedrohung für Menschen
Harmless
Nutzung durch Menschen
Fischereien: kommerzielles potential
Tools
Zusatzinformationen
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Internet Quellen
Schätzungen auf der Grundlage von Modellen
Phylogenetischer Diversitätsindex (Ref. 82804) |
PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00447 (0.00185 - 0.01077), b=3.17 (2.96 - 3.38), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245). |
Trophische Ebene (Ref. 69278) |
3.2 ±0.4 se; based on size and trophs of closest relatives |
Anfälligkeit der Fischerei (Ref. 59153) |
Low vulnerability (10 of 100). 🛈 |
Preiskategorie (Ref. 80766) |
Unknown.
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