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Gnathonemus longibarbis (Hilgendorf, 1888)

Longnose stonebasher
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Gnathonemus longibarbis
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Classification / Names Noms communs | Synonymes | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinoptérygiens (poissons à nageoires rayonnées) > Osteoglossiformes (Bony tongues) > Mormyridae (Elephantfishes)
Etymology: Gnathonemus: Greek, gnathos = jaw + Greek, nema = filament (Ref. 45335).  More on author: Hilgendorf.

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

; eau douce démersal; potamodrome (Ref. 10608); profondeur 27 - 45 m (Ref. 9606).   Tropical

Distribution Pays | Zones FAO | Écosystèmes | Occurrences | Point map | Introductions | Faunafri

Africa: Victoria Nile (Ref. 1880), Lake Kyoga (Ref. 4903), Lake Victoria basin (Ref. 34290), Middle Akagera River system (Ref. 46152), Malagarazi River (Ref. 54847, 98755), Lake Tanganyika (Ref. 45485).

Length at first maturity / Taille / Poids / Âge

Maturity: Lm ?, range 10 - ? cm
Max length : 36.0 cm TL mâle / non sexé; (Ref. 52331)

Biologie     Glossaire (ex. epibenthic)

In Lake Kyoga abundant among or near water lilies (Ref. 49805) and in Lake Victoria it occurs in shallow, inshore waters over sandy and rocky shores (Ref. 4903, 97924), seasonally over muddy bottoms adjacent to papyrus swamps or deep water near rocky islands (Ref. 9606, 97924). Feeds on bottom and in marginal vegetation; insectivorous (chironomid larvae, Povilla, Odonata larvae), but arthropods, oligochaetes and fish eggs are also eaten (Ref. 12526). Uses sensitive pointed addition to chin for testing holes in mud, papyrus roots and between stones to locate underwater insects (Ref. 36900). Rotates body to almost vertical position, searches substrate and grabs prey into mouth; produces weak electric organ discharge for navigation and to warn off other organisms (Ref. 97924). Oviparous (Ref. 205). Breeds twice a year during the rainy seasons, and migrates up rivers to spawn (Ref. 10608).

Life cycle and mating behavior Maturité | Reproduction | Frai | Œufs | Fécondité | Larves

Référence principale Upload your references | Références | Coordinateur | Collaborateurs

Gosse, J.-P., 1984. Mormyridae. p. 63-122. In J. Daget, J.-P. Gosse and D.F.E. Thys van den Audenaerde (eds.) Check-list of the freshwater fishes of Africa (CLOFFA). ORSTOM, Paris and MRAC, Tervuren. Vol. 1. (Ref. 3203)

Statut dans la liste rouge de l'IUCN (Ref. 119314)

  Préoccupation mineure (LC) ; Date assessed: 16 December 2015

CITES (Ref. 115941)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Menace pour l'homme

  Harmless





Utilisations par l'homme

Pêcheries: sans intérêt
FAO(Publication : search) | FishSource |

Plus d'informations

Pays
Zones FAO
Écosystèmes
Occurrences
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Stocks
Écologie
Régime alimentaire
Éléments du régime alimentaire
Consommation alimentaire
Ration
Noms communs
Synonymes
Métabolisme
Prédateurs
Écotoxicologie
Reproduction
Maturité
Frai
Rassemblement de ponte
Fécondité
Œufs
Développement de l'œuf
Taille/Âge
Croissance
Longueur-poids
Longueur-longueur
Fréquences de longueurs
Morphométrie
Morphologie
Larves
Dynamique des populations larvaires
Recrutement
Abondance
Références
Aquaculture
Profil d'aquaculture
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Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5625   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01288 (0.00598 - 0.02775), b=2.84 (2.66 - 3.02), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
Niveau trophique (Ref. 69278):  3.2   ±0.3 se; Based on size and trophs of closest relatives
Résilience (Ref. 69278):  Milieu, temps minimum de doublement de population : 1,4 à 4,4 années (Fec = 502).
Vulnérabilité (Ref. 59153):  Low to moderate vulnerability (29 of 100) .