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> Gymnotiformes (Knifefishes) > Gymnotidae (Naked-back knifefishes) > Gymnotinae
Etymology: Gymnotus: Greek, gymnos = naked (Ref. 45335); jonasi: Named in honor of Jonas Alves de Oliveira, a Brazilian naturalist working for the Mamirauá Sustainable Development Reserve (Ref. 41292).

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

; zoet water benthopelagisch. Subtropical

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South America: Amazon River basin, Brazil.

Grootte / Gewicht / Leeftijd

Maturity: L_m ? range ? - ? cm
Max length : 13.5 cm TL mannelijk / geslacht onbekend; (Ref. 41292); max. gepubliceerd gewicht: 4.00 g (Ref. 41292)

Korte beschrijving Determinatiesleutels | Morfologie | Morfometrie

Electric organs present.

Facultative air-breathing in the genus (Ref. 126274); Recorded from root mass of floating meadows in the whitewater floodplains of the Tefé region where it is common although patchy in distribution. Adults both breed and forage in the meadows and are never encountered in other floodplain habitats such as flooded forests. Both juveniles and adults feed on small aquatic animals, especially chironomid larvae (Ref. 41292).

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Albert, J.S. and W.G.R. Crampton, 2001. Five new species of Gymnotus (Teleostei: Gymnotiformes) from an upper Amazon floodplain, with descriptions of electric organ discharges and ecology. Ichthyol. Explor. Freshwat. 12(3):241-266. (Ref. 41292)

Status op de Rode Lijst van het IUCN (Ref. 130435)

Niet bedreigd (LC) ; Date assessed: 01 March 2007

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Gevaar voor de mens

Harmless

Gebruik door de mens

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Estimates based on models

Fylogenetische diversiteitsindex (Ref. 82804): PD₅₀ = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).

Trofisch niveau (Ref. 69278): 2.5 ±0.50 se; based on food items.

Weerstandsvermogen (Ref. 120179): Hoog, minimale populatieverdubbelingstijd minder dan 15 maanden (Preliminary K or Fecundity.).

Fishing Vulnerability (Ref. 59153): Low vulnerability (10 of 100).

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Gymnotus jonasi Albert & Crampton, 2001