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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 Ecologia

; acqua dolce benthopelagico. Subtropical

Distribuzione Stati | Aree FAO | Ecosystems | Presenze | Point map | Introduzioni | Faunafri

South America: Amazon River basin, Brazil.

Size / Peso / Age

Maturity: L_m ? range ? - ? cm
Max length : 13.5 cm TL maschio/sesso non determinato; (Ref. 41292); peso massimo pubblicato: 4.00 g (Ref. 41292)

Short description Chiavi di identificazione | Morfologia | Morfometria

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).

Life cycle and mating behavior Maturities | Riproduzione | Spawnings | Egg(s) | Fecundities | Larve

Main reference Upload your references | Bibliografia | Coordinatore : Campos-da-Paz, Ricardo | Collaboratori

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)

IUCN Red List Status (Ref. 130435)

Least Concern (LC) ; Date assessed: 01 March 2007

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Harmless

Human uses

FAO - Publication: search | FishSource |

Informazioni ulteriori

Trophic ecology
Prede
Diet compositions
Food consumptions
Food rations
Predatori

Ecology
Ecologia

Population dynamics
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Max. ages / sizes
Length-weight rel.
Length-length rel.
Length-frequencies
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Life cycle
Riproduzione
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Egg(s)
Egg developments
Larve
Dinamica popolazioni larvali

Distribution
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Anatomy
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Physiology
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Swimming type
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Visual pigment(s)
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Diseases / Parasites
Toxicities (LC50s)

Genetics
Genetica
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Human related
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Profili di acquacoltura
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Estimates based on models

Phylogenetic diversity index (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).

Trophic level (Ref. 69278): 2.5 ±0.50 se; based on food items.

Resilienza (Ref. 120179): Alto, tempo minimo di raddoppiamento della popolazione meno di 15 mesi (Preliminary K or Fecundity.).

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

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Gymnotus jonasi Albert & Crampton, 2001