Gymnarchus niloticus, Aba : fisheries

Gymnarchus niloticus Cuvier, 1829

Aba
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Classification / Noms Noms communs | Synonymes | Catalog of Fishes(Genre, Espèce) | ITIS | CoL | WoRMS | Cloffa

> Osteoglossiformes (Bony tongues) > Gymnarchidae (Abas)
Etymology: Gymnarchus: Greek, gymnos = naked + Greek, archos = anus (Ref. 45335).
More on author: Cuvier.

Environnement : milieu / zone climatique / profondeur / gamme de distribution Écologie

; eau douce démersal; pH range: 6.5 - 8.0; dH range: 10 - 25; potamodrome (Ref. 51243). Tropical; 23°C - 28°C (Ref. 13614); 18°N - 2°N, 16°W - 36°E

Distribution Territoires | Zones FAO | Écosystèmes | Occurrences | Carte par point | Introductions | Faunafri

Africa: basins of the rivers Senegal, Gambia, Volta, Niger and Chad in West Africa (Ref. 3530, 81275). Also in the Nile River basin (Ref. 3530, 28714) and Lake Turkana (Ref. 3530, 52331).

Taille / Poids / Âge

Maturité: Lm ?  range ? - ? cm
Max length : 167 cm SL mâle / non sexé; (Ref. 2915); poids max. publié: 18.5 kg (Ref. 2915)

Description synthétique Clés d'identification | Morphologie | Morphométrie

Épines dorsales (Total) : 0; Rayons mous dorsaux (Total) : 183 - 230. Diagnosis: body very elongate (Ref. 28714, 81275), anguilliform (Ref. 81275), its depth 7.2-10.6 times in SL, and covered with tiny scales (Ref. 2915, 81275). Lateral line complete (Ref. 81275). Dorsal fin soft-rayed, extending almost over the entire length of back (Ref. 81275), stopping short of a naked tail (Ref. 28714). Pelvic, anal and caudal fins absent (Ref. 28714, 81275), body ending in a thin/sharp point (Ref. 2915, 81275). Pectoral fins reduced (Ref. 81275), 1.9-5.0 times in head length (Ref. 2915, 81275). Head naked, its length 5.6-6.9 times in SL; snout prominent (Ref. 2915, 81275). Mouth large and terminal; teeth strong, pointed or notched, aligned in a single row in both jaws, 12-16 in upper, 22-28 in lower jaw; premaxillae, as well as vomer and palatines, coalesced; maxillae, vomer and palatines toothless; eye very small, without a free margin (covered by skin); only the left gonad is developed and functional (Ref. 81275). Coloration: dark grey to almost black, darker posteriorly; belly whitish (Ref. 81275).
Body shape (shape guide): elongated; Cross section: circular.

Biologie     Glossaire (ex. epibenthic)

Obligate air-breathing (Ref. 126274); Obligate air-breathing (Ref. 118411, 126274). Inhabits marginal vegetation and swamps constructing a flask-shaped nest in vegetation during the floods, which it is reputed to defend with vigour (Ref. 28714). Following flooding of the Gambia River banks, large elliptical floating nests are build in densely vegetated swamps at depths of about 1-1.5 m, in which about 1000 ‘amber-like’ eggs are laid; larvae hatch after 5 days (Ref. 10609). Feeds on crustaceans, insects and fish (Ref. 28714). No pelvic, anal or caudal fins (Ref. 28714). Possesses an electric organ that extends along almost the entire trunk to the tip of the tail (Ref. 10840). Also equipped with ampullary receptors and two types of tuberous receptors for electroreception (Ref. 10841). Showed increased electric organ discharge (EOD) rate by 50-60 Hz between 21 and 31°C (Ref. 10837).

Cycle de vie et comportement reproducteur Maturité | Reproduction | Frai | Œufs | Fécondité | Larves

Breeds in well-vegetated, marginal areas of swamps and rivers, where a large, floating nest, about 1 m in diameter, is constructed, in which the eggs are laid and later guarded by one of the parents (Ref. 27583). Distinct pairing (Ref. 205).

Référence principale Téléchargez vos références | Références | Coordinateur | Collaborateurs

Bigorne, R., 1990. Gymnarchidae. p. 185-186. In C. Lévêque, D. Paugy and G.G. Teugels (eds.) Faune des poissons d'eaux et saumâtres d'Afrique de l'Ouest. tome 1. Faune Trop. 28. Musée Royal de l'Afrique Centrale, Tervuren, Belgique and ORSTOM, Paris. (Ref. 2911)

Statut dans la liste rouge de l'IUCN (Ref. 130435: Version 2025-2 (Global))

  Préoccupation mineure (LC) ; Date assessed: 12 May 2019

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Menace pour l'homme

  Harmless





Utilisations par l'homme

Pêcheries: commercial
FAO - Systèmes d'aquaculture: production searchpêcheries: landings search; Publication: search | FishSource |

Plus d'informations

Écologie trophique
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Composition du régime alimentaire
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Rations alimentaires
Prédateurs
Écologie
Écologie
Dynamique des populations
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Rel. longueur-longueur.
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Distribution
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génôme
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Sources Internet

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | Websites from users | FishWatcher | CISTI | Catalog of Fishes: Genre, Espèce | DiscoverLife | ECOTOX | FAO - Systèmes d'aquaculture: production searchpêcheries: landings search; Publication: search | Faunafri | Fishipedia | Fishtrace | GloBI | Google Books | Google Scholar | Google | IGFA World Record | OneZoom | Open Tree of Life | Otolith Atlas of Taiwan Fishes | Aquariums publics | PubMed | Reef Life Survey | Socotra Atlas | TreeBase | Arbre de Vie | Wikipedia: aller à, chercher | World Records Freshwater Fishing | Zoobank | Zoological Record

Estimations basées sur des modèles

Indice de diversité phylogénétique
(Réf. 82804)
PD50 = 1.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight a=0.00427 (0.00162 - 0.01126), b=3.09 (2.87 - 3.31), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Niveau trophique
(Réf. 69278)
3.7   ±0.58 se; based on food items.
Generation time 6.5 ( na - na) years. Estimated as median ln(3)/K based on 1 growth studies.
Résilience
(Réf. 120179)
Faible, temps minimum de doublement de population : 4,5 à 14 années (K=0.12-0.17).
Vulnérabilité de la pêche
(Ref. 59153)
High vulnerability (63 of 100). 🛈
Catégorie de prix
(Ref. 80766)
Unknown.
Nutriments
(Ref. 124155)
Calcium = 62.6 [33.3, 136.7] mg/100g; Iron = 1.01 [0.56, 2.07] mg/100g; Protein = 17.4 [15.5, 19.1] %; Omega3 = 0.27 [0.11, 0.68] g/100g; Selenium = 118 [43, 271] μg/100g; VitaminA = 17 [6, 45] μg/100g; Zinc = 1.05 [0.73, 1.57] mg/100g (wet weight);