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Gymnarchus niloticus  Cuvier, 1829

Aba
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Gymnarchus niloticus
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Classification / Names Nomi Comuni | Sinonimi | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

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

Ambiente / Clima / Range Ecologia

; acqua dolce demersale; pH range: 6.5 - 8.0; dH range: 10 - 25; potamodromo (Ref. 51243).   Tropical; 23°C - 28°C (Ref. 13614), preferred ?; 18°N - 2°N, 16°W - 36°E

Distribuzione Stati | Aree FAO | Ecosystems | Presenze | Point map | Introduzioni | Faunafri

Africa: occurring in the Gambia, Senegal, Niger, Volta and Chad River basins (Ref. 81275), Lake Turkana (Ref. 52331, 82489) and the Baro River drainage (Ref. 58460).

Size / Peso / Age

Maturity: Lm ?  range ? - ? cm
Max length : 167 cm SL maschio/sesso non determinato; (Ref. 2915); Peso massimo pubblicato: 18.5 kg (Ref. 2915)

Short description Morfologia | Morfometria

Spine dorsali (totale): 0; Raggi dorsali molli (totale): 183-230. Body depth 7.2-10.3 x SL. Head 5.6-6.9 x SL. Snout prominent. Pectorals 1.9-5.0 x head length. Body terminates in thin point. Head without scales. Scales small.

Biologia     Glossario (es. epibenthic)

Following flooding of the river banks (Gambia River), this species builds large elliptical floating nests in densely vegetated swamps at depths of about 1-1.5 m; lays about 1000 `amber-like' eggs; larvae hatching after 5 days (Ref. 10609). Feeds on crustaceans, insects and fish (Ref. 28714). No pelvic, anal or caudal fins. 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).

Life cycle and mating behavior Maturità | Riproduzione | Deposizione | Uova | Fecundity | Larve

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

Main reference Upload your references | Bibliografia | Coordinatore | Collaboratori

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)

IUCN Red List Status (Ref. 115185)

CITES (Ref. 94142)

Not Evaluated

Threat to humans

  Harmless




Human uses

Pesca: commerciale
FAO(Acquacoltura: production; pesca: production; publication : search) | FisheriesWiki | Sea Around Us

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