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Osteoglossiformes (Bony tongues) >
Mormyridae (Elephantfishes)
Etymology: Gnathonemus: Greek, gnathos = jaw + Greek, nema = filament (Ref. 45335).
Eponymy: Wilhelm Karl Hartwig Peters (1815–1883) was a German zoologist and traveller who made some very important collections in Mozambique. [...] (Ref. 128868), visit book page.
More on author: Günther.
Environment: milieu / climate zone / depth range / distribution range
Ecologie
; zoet water demersaal; pH range: 6.0 - 8.0; dH range: 5 - 19. Tropical; 22°C - 28°C (Ref. 1672)
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).
Grootte / Gewicht / Leeftijd
Maturity: Lm ? range ? - ? cm
Max length : 35.0 cm SL mannelijk / geslacht onbekend; (Ref. 2915)
Dorsale stekels (totaal) : 0; Dorsale zachte stralen (totaal) : 25 - 31; Anale stekels: 0; Anale zachte stralen: 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).
Levenscyclus en paargedrag
Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven
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 op de Rode Lijst van het IUCN (Ref. 130435: Version 2024-1)
Gevaar voor de mens
Harmless
Gebruik door de mens
Visserij: visserij voor eigen gebruik; Aquarium: Commercieel
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Estimates based on models
Fylogenetische diversiteitsindex (Ref.
82804): PD
50 = 0.5625 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01288 (0.00598 - 0.02775), b=2.86 (2.68 - 3.04), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Trofisch niveau (Ref.
69278): 3.1 ±0.34 se; based on food items.
Weerstandsvermogen (Ref.
120179): Gemiddeld, minimale populatieverdubbelingstijd 1,4-4,4 jaar (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low to moderate vulnerability (33 of 100).
Nutrients (Ref.
124155): Calcium = 169 [84, 395] mg/100g; Iron = 1.59 [0.74, 3.23] mg/100g; Protein = 17.7 [15.3, 20.0] %; Omega3 = 0.518 [0.209, 1.314] g/100g; Selenium = 70.2 [26.4, 176.7] μg/100g; VitaminA = 35.8 [12.9, 96.4] μg/100g; Zinc = 1.74 [1.14, 3.40] mg/100g (wet weight);
