Nannocharax usongo : fisheries

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Nannocharax usongo Dunz & Schliewen, 2009

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drawing shows typical species in Distichodontidae.

Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Teleostei (teleosts) > Characiformes (Characins) > Distichodontidae (Distichodus)
Etymology: Nannocharax: Latin, nannus = small + Greek, charax = a marine fish without identification (Ref. 45335);  usongo: Named in honor of Dr. Leonard Usongo, highly successful conservation biologist and supporter of numerous fish inventories in Cameroon (Ref. 80507).

Environment: milieu / climate zone / depth range / distribution range Ecology

Freshwater; benthopelagic. Tropical; 6°N - 5°N, 6°E - 10°E

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

Africa: Cross River and Niger Delta (Ref. 80507).

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 4.4 cm SL male/unsexed; (Ref. 80507)

Short description Morphology | Morphometrics

Dorsal spines (total): 0; Dorsal soft rays (total): 10-14; Anal spines: 0; Anal soft rays: 10 - 12. Diagnosis: Nannocharax usongo is distinguished from all other described Nannocharax species by its very small distance between the posterior border of the anus and the articulation of first anal-fin ray (0.9–1.9 vs. 2.2–14.2% of standard length), its body coloration, which consist of 7–11 mostly big blotches along the lateral line often coalesced to one wide black band, and 7–12 small blotches along the dorsum (Ref. 80507).

Biology     Glossary (e.g. epibenthic)

Type specimens collected on logs in areas of relatively rapid water movement; logs had a very rugged surface due to being partially decomposed by wood eating Povilla (Ephemeroptera) larvae; individuals were spaced singly and moved very rapidly around log surface, but always with close contact to it and never reaching out into the free water column; first ray of pelvic fin very thick, which is adaptation to cling on wood in strong current; mouth subinferior and blunt (Ref. 80507).

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

Main reference Upload your references | References | Coordinator | Collaborators

Dunz, A.R. and U.K. Schliewen, 2009. Description of two new species of Nannocharax Günther, 1867 (Teleostei: Characiformes: Distichodontidae) from the Cross River, Cameroon. Zootaxa 2028:1-19. (Ref. 80507)

IUCN Red List Status (Ref. 130435)


CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

Fisheries:
FAO - Publication: search | FishSource |

More information

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Internet sources

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | BOLDSystems | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes: genus, species | DiscoverLife | ECOTOX | FAO - Publication: search | Faunafri | Fishipedia | Fishtrace | GenBank: genome, nucleotide | GloBI | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | Tree of Life | Wikipedia: Go, Search | World Records Freshwater Fishing | Zoobank | Zoological Record

Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5000   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00380 (0.00147 - 0.00981), b=3.11 (2.88 - 3.34), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Trophic level (Ref. 69278):  3.1   ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref. 59153):  Low vulnerability (10 of 100).