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Actinopterygii (ray-finned fishes) > Characiformes (Characins) > Distichodontidae (Distichodus)
Etymology: Nannocharax: Latin, nannus = small + Greek, charax = a marine fish without identification (Ref. 45335); signifer: From the Latin word signifer, meaning color sergeant or standrad bearer, in referece to the unusual red-orange color on the dorsal fin.

Environment / Climate / Range Ecology

Freshwater; demersal; pH range: 7.0 - 7.4. Tropical; 28°C - 29°C (Ref. 83417), preferred ?

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Africa: Ouémé River basin in Benin (Ref. 83417).

Size / Weight / Age

Maturity: L_m ? range ? - ? cm
Max length : 6.0 cm SL male/unsexed; (Ref. 83417)

Short description Morphology | Morphometrics

Dorsal soft rays (total): 12-14; Anal soft rays: 10 - 11; Vertebrae: 38 - 39. Distinguished from all its congeners in West Africa by the red-orange coloration of the anterior part of dorsal fin. Differs further by the combination of the following characters: absence of continuous black band along the flank; multiple x-shaped body color pattern extending on the lower half of the flank; 46-48 scales (usually 47) along the lateral line; and 4-5 scales between anus and anal-fin origin (Ref. 83417).

Found in a narrow forest stream with dense vegetation on its banks and with bottom substrate of mud, sand, leaves, roots and drift wood, where it was collected between the roots of the overhanging bank; also occurs in a larger stream with only spare vegetation in the form of small bushes and solitary trees and with bottom substrate consisting mainly of sand and gravel (Ref. 83417).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator | Collaborators

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. 83417)

IUCN Red List Status (Ref. 109396)

Not Evaluated

CITES (Ref. 94142)

Not Evaluated

Threat to humans

Harmless

Human uses

Fisheries:

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Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805): PD₅₀ = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00380 (0.00147 - 0.00985), b=3.11 (2.88 - 3.34), based on LWR estimates for this (Sub)family-body shape (Ref. 93245).

Trophic Level (Ref. 69278): 3.2 ±0.4 se; Based on size and trophs of closest relatives

Resilience (Ref. 69278): High, minimum population doubling time less than 15 months ().

Vulnerability (Ref. 59153): Low vulnerability (10 of 100) .

Nannocharax signifer Moritz, 2010