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Gymnotus chimarrao  Cognato, Richer-de-Forges, Albert & Crampton, 2008

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Gymnotus chimarrao
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drawing shows typical fish in this Family.

Classification / Names Noms communs | Synonymes | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinoptérygiens (poissons à nageoires rayonnées) > Gymnotiformes (Knifefishes) > Gymnotidae (Naked-back knifefishes)
Etymology: Gymnotus: Greek, gymnos = naked (Ref. 45335);  chimarrao: Named for chimarrão, the traditional mate tea (Ilex paraguariensis) of Rio Grande do Sul, Brazil and neighboring counties. State, Brazil.

Environnement / Climat / Gamme Écologie

; eau douce benthopélagique.   Tropical, preferred ?

Distribution Pays | Zones FAO | Écosystèmes | Occurrences | Point map | Introductions | Faunafri

South America: Arroio Grande in the Rio Taquari drainage, Brazil.

Taille / Poids / Âge

Maturity: Lm ?  range ? - ? cm
Max length : 23.7 cm TL mâle / non sexé; (Ref. 75065)

Description synthétique Morphologie | Morphométrie

Rayons mous anaux: 180 - 213. Distinguished from all 32 congeners except for some specimens (over 30.0 cm) of Gymnotus ardilai from the Río Magdalena drainage in northwest South America in having a pigmentation pattern in which the oblique dark-pigmented bands are faint, and difficult to distinguish from the ground color. Diagnosed from Gymnotus ardilai in having a shallower body depth (7.4-9.1 % TL [mean 8.2] vs. 11.4-13.2 [12.3]). Differs also from all species in the Gymnotus pantherinus species-group (and is placed in the Gymnotus carapo species-group) by the presence of two (vs. one) laterosensory canal pores in the preopercular-mandibular series of the dorsoposterior portion of the preopercle. Can be differentiated from all species in the Gymnotus carapo species-group that occur south of the Amazon basin except Gymnotus inaequilabiatus in having a much shallower body depth (7.4-9.1 % TL [mean 8.2] vs. 8.9-11.6 [mean 11.1] in Gymnotus bahianus, 9.8-10.3 [mean 10.1] in Gymnotus paraguensis, and 10.3-13.1 [mean 11.7] in Gymnotus sylvius). Differs further from Gymnotus inaequilabiatus in possessing a substantially narrower head (53.1-59.3 % HL [mean 57.5] vs. 65.3- 72.0 [mean 67.8]) (Ref. 75065).

Biologie     Glossaire (ex. epibenthic)

This species is known from a small stream, 1.5 m width, running through gallery forest in low hills, with altitude 54 m above mean sea level; substrate is mud and sand. All captured specimens were from marginal grasses rooted to the bottom of the stream in areas sheltered from the stream flow (with negligible current); dark-stained water; conductivity 107 ?S·cm-1, temperature 24.1 °C (Ref. 75065)

Life cycle and mating behavior Maturité | Reproduction | Frai | Œufs | Fécondité | Larves

Référence principale Upload your references | Références | Coordinateur : Campos-da-Paz, Ricardo | Collaborateurs

Cognato, D., M.M. Richer-de-Forges, J.S. Albert and W.G.R. Crampton, 2008. Gymnotus chimarrao, a new species of electric fish (Gymnotiformes: Gymnotidae) from southern Brazil. Ichthyol. Explor. Freshwat. [2007] 18(4):375-382. (Ref. 75065)

Statut dans la liste rouge de l'IUCN (Ref. 115185)

  Non évalué 

CITES (Ref. 94142)

Not Evaluated

Menace pour l'homme

  Harmless




Utilisations par l'homme

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