Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Gymnotiformes
(Knifefishes) > Gymnotidae
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
Freshwater; demersal; pH range: 6.9 - 7.3. Subtropical
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 / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 24.3 cm TL male/unsexed; (Ref. 41292); max. published weight: 40.00 g (Ref. 41292)
Morphology | Morphometrics
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).
Oviparous (Ref. 205). Males provide parental care in nests excavated for larvae (Ref. 55570).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
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).
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. 119314)
CITES (Ref. 115941)
Threat to humans
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00427 (0.00200 - 0.00911), b=3.04 (2.84 - 3.24), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.3 ±0.47 se; Based on food items.
Resilience (Ref. 69278
): High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Low vulnerability (23 of 100) .