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Gnathonemus petersii  (Günther, 1862)

Elephantnose fish
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Image of Gnathonemus petersii (Elephantnose fish)
Gnathonemus petersii
Picture by Moreau, J.

Classificação / Names Nomes comuns | Sinônimos | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (peixes com raios nas barbatanas) > Osteoglossiformes (Bony tongues) > Mormyridae (Elephantfishes)
Etymology: Gnathonemus: Greek, gnathos = jaw + Greek, nema = filament (Ref. 45335).

Ambiente / Clima / Intervalo Ecologia

; Água doce demersal; pH range: 6.0 - 8.0; dH range: 5 - 19.   Tropical; 22°C - 28°C (Ref. 1672), preferred ?

Distribuição Países | Áreas FAO | Ecossistemas | Ocorrências | Point map | Introduções | Faunafri

Africa: Niger to Congo River basins (Ref. 3203). Widespread in the Congo basin (Ref. 1878, 4910, 11970, 41580, 41591, 106245, 106290). Also reported from the Cuanza in Angola (Ref. 99599) and Lake Tanganyika (Ref. 114071). Report from Lake Kivu questionable and probably erroneous (Ref. 51936).

Tamanho / Peso / Idade

Maturity: Lm ?  range ? - ? cm
Max length : 35.0 cm SL macho/indeterminado; (Ref. 2915)

Descrição suscinta Morfologia | Morfometria

Espinhos dorsais (total): 0; Raios dorsais (total): 25-31; Espinhos anais 0; Raios anais : 32 - 36

Biologia     Glossário (p.ex. epibenthic)

Occurs close to the bottom where it probes for food with the long snout. Territorial and usually aggressive towards members of its own species. This behavior has been shown to involve electric organ discharge (EOD) activity (Ref. 10011). Feeds mostly at night on worms and insects (Ref. 7020), probably aided by electro-sensory inputs (Ref. 10011). Electroreceptors are distributed over the entire head, the dorsal and ventral regions of the body, but absent from the side and the caudal peduncle where the electric organ is located (Ref. 10011). Sex-related EOD characteristics in this species has been demonstrated in the laboratory with freshly imported samples during the breeding season; such EOD dimorphism changed with time in captivity (Ref. 10764; 10766). Lead nitrate in water significantly increased EOD rate and selectively altered the EOD waveform of this species (Ref. 10469). Dubbed a `hearing specialist' having auditory abilities in the range of 100-2500 Hz, with `best frequencies' between 300 and 600 Hz (Ref. 10830). Aquarium keeping: in groups of 5 or more individuals; minimum aquarium size 150 cm; not recommended for home aquariums (Ref. 51539).

Life cycle and mating behavior Maturidade | Reprodução | Desova | Ovos | Fecundidade | Larvas

Referência principal Upload your references | Referências | Coordenador | Colaboradores

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)

Status na Lista Vermelha da IUCN (Ref. 115185)

CITES (Ref. 94142)

Not Evaluated

Perigo para os humanos

  Harmless




Uso pelos humanos

Pescarias: pescarias de subsistência; Aquário: Espécies comerciais
FAO(Publication : search) | FisheriesWiki | Sea Around Us

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