Congo (Kinshasa) country information

Common names: [No common name]
Occurrence: native
Salinity: freshwater
Abundance: | Ref:
Importance: | Ref:
Aquaculture: | Ref:
Regulations: | Ref:
Uses: live export: yes;
Comments: Widespread; known from the lower Congo River basin (Ref. 1879), Pool Malebo (Ref. 41585), middle Congo River (Ref. 1878, 4910, 41590, 41591), Kasai (Ref. 11970, 41591), Sankuru (Ref. 1880, 11970), Lake Tumba (Ref. 41580, 41591), Ubangi (Ref. 1878, 45441), Uélé (Ref. 41594), Luilaka and Salonga rivers (Ruki drainage)(Ref. 93897), Itimbiri, Aruwimi (Ref. 41590, 106290), Lindi-Tshopo (Ref. 106290), Wagenia Falls (Ref. 1878, 106245), Lualaba (Ref. 41590), upper Lualaba (Ref. 45616) and Lake Mweru (Ref. 2266).
National Checklist:
Country Information: https://www.cia.gov/library/publications/resources/the-world-factbook/geos/cg.html
National Fisheries Authority:
Occurrences: Occurrences Point map
Main Ref: David, L. and M. Poll, 1937
National Database:

Common names from other countries

Elephant nose, Elefantfisk, Spitzbartfisch, ... more

Classificação / Names Nomes comuns | Sinónimos | Catalog of Fishes(Género, Espécies) | ITIS | CoL | WoRMS | Cloffa

> Osteoglossiformes (Bony tongues) > Mormyridae (Elephantfishes)
Etymology: Gnathonemus: Greek, gnathos = jaw + Greek, nema = filament (Ref. 45335).
More on author: Günther.

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

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

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 Lake Tanganyika (Ref. 114071). Report from the Cuanza in Angola (Ref. 99599) unconfirmed in Ref. 120641. Reports from Lake Kivu are erroneous (Ref. 46152, 107916).

Tamanho / Peso / Idade

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

Descrição breve Chaves de identificação | Morfologia | Morfometria

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

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 Maturities | Reprodução | Spawnings | Egg(s) | Fecundities | 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)

Categoria na Lista Vermelha da IUCN (Ref. 130435)

Preocupação menor (LC) ; Date assessed: 03 September 2019

CITES (Ref. 128078)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Ameaça para o homem

Harmless

Utilização humana

Pescarias: pescarias de subsistência; Aquário: Espécies comerciais

FAO(Publication : search) | FishSource |

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Estimates based on models

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.01318 (0.00612 - 0.02839), b=2.85 (2.67 - 3.03), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).

Nível Trófico (Ref. 69278): 3.1 ±0.34 se; based on food items.

Resiliência (Ref. 120179): Médio, tempo mínimo de duplicação da população 1,4 - 4,4 anos (Preliminary K or Fecundity.).

Fishing Vulnerability (Ref. 59153): Low to moderate vulnerability (33 of 100).

Categoria de preço (Ref. 80766): Unknown.

Gnathonemus petersii (Günther, 1862)