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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).
Environment: milieu / climate zone / depth range / distribution range
Οικολογία
; Γλυκού νερού Πελαγικό(ά); pH range: 7.0 - 7.4. Tropical; 28°C - 29°C (Ref. 85591)
Africa: Ouémé River basin in Benin (Ref. 85591).
Μέγεθος / Βάρος / Age
Maturity: Lm ? range ? - ? cm
Max length : 5.7 cm SL αρσενικό/απροσδιόριστο; (Ref. 85591)
Short description
Κλείδες προσδιορισμού | Μορφολογία | Μορφομετρία
Ραχιαίες άκανθες (συνολικά) : 0; Μαλακές ραχιαίες ακτίνες (συνολικά) : 12 - 14; Εδρικές άκανθες: 0; Μαλακές εδρικές ακτίνες: 10 - 11; Σπόνδυλοι: 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).
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).
Life cycle and mating behavior
Γεννητική Ωρίμανση | Αναπαραγωγή | Γεννοβολία | Αβγά | Γονιμότητα | Προνύμφες
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 Red List Status (Ref. 130435: Version 2024-2)
Threat to humans
Harmless
Human uses
αλιεία: με δυνητικό ενδιαφέρον
Εργαλεία
Special reports
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Διαδικτυακές πηγές
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00447 (0.00189 - 0.01058), b=3.17 (2.96 - 3.38), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Τροφικό Επίπεδο (Ref.
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
