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> Gymnotiformes (Knifefishes) > Gymnotidae (Naked-back knifefishes) > Gymnotinae
Etymology: Gymnotus: Greek, gymnos = naked (Ref. 45335); mamiraua: Named for the Mamirauá lake system and the Mamirauá Sustainable Development Reserve (formerly the Estaçao Ecológica Mamirauá). Noun in apposition..

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

; sötvatten bottenlevande; pH range: 6.9 - 7.3. Subtropical

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South America: two whitewater lake systems on the Rio Solimões floodplain of central Amazonia (the Mamirauá lake system near Tefé, and Lago Janauacá near Manaus), Amazonas State, Brazil (Ref. 41292).

Size / Vikt / Age

Maturity: L_m ? range ? - ? cm
Max length : 24.3 cm TL hane/ej könsbestämd; (Ref. 41292); publicerad maxvikt: 40.00 g (Ref. 41292)

Short description Bestämningsnycklar | Morfologi | Morfometri

Deep body (body depth 11-13% TL versus 6-10) possessing very thin pale bands (less than 1/5 the width of the dark bands) with sharp (high contrast) margins. Bands are sinuous on the anterior half of the body, and extend clearly to the dorsal midline (Ref. 41292).

Facultative air-breathing in the genus (Ref. 126274); Oviparous (Ref. 205). Males provide parental care in nests excavated for larvae (Ref. 55570).

Life cycle and mating behavior Maturities | Reproduktion | Spawnings | Egg(s) | Fecundities | Larver

Parental care is provided by the male. Nests consisted of a group of small juveniles under a dense roots of floating macrophytes which are attended by a single male adult (Ref. 55570).

Main reference Upload your references | referenser | Koordinator : Campos-da-Paz, Ricardo | Medarbetare

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: 07 November 2018

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Harmless

Human uses

FAO - Publication: search | FishSource |

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Trophic ecology
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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=0.00437 (0.00209 - 0.00911), b=2.98 (2.79 - 3.17), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).

Trofisk nivå (Ref. 69278): 3.3 ±0.47 se; based on food items.

Resiliens (Ref. 120179): Hög, lägsta populationsfördubblingstid mindre än 15 månader (Preliminary K or Fecundity.).

Fishing Vulnerability (Ref. 59153): Low vulnerability (14 of 100).

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Gymnotus mamiraua Albert & Crampton, 2001