分類 / Names
俗名 | 同種異名 | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii 輻鰭魚綱 (條鰭魚)
(Knifefishes) 電鰻目 (Knifefishes)
(Naked-back knifefishes) 裸背電鰻科 (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.
Environment: milieu / climate zone / depth range / distribution range
; 淡水 底中水層性.
South America: Arroio Grande in the Rio Taquari drainage, Brazil.
大小 / 重量 / 年齡
Maturity: Lm ?  range ? - ? cm
Max length : 24.3 cm TL 雄魚/尚未辨別雌雄; (Ref. 118108)
型態特徵 | 形態測量圖
臀鰭軟條: 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).
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
成熟度 | 繁殖 | 產卵場 | 卵 | 孕卵數 | 仔魚
Cognato, D., M.M. Richer-de-Forges, J.S. Albert and W.G.R. Crampton, 2007. Gymnotus chimarrao, a new species of electric fish (Gymnotiformes: Gymnotidae) from southern Brazil. Ichthyol. Explor. Freshwat. 18(4):375-382. (Ref. 75065)
CITES (Ref. 115941)
合作者照片Stamps, Coins Misc.聲音神經毒速度泳型鰓區Otoliths腦重體重比眼睛色素
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=0.00589 (0.00179 - 0.01938), b=2.97 (2.72 - 3.22), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
營養階層 (Ref. 69278
): 3.3 ±0.4 se; Based on size and trophs of closest relatives
回復力 (Ref. 69278
): 高度, 族群倍增時間少於 15個月 (Preliminary K or Fecundity.).
瀕危性 (Ref. 59153
): Low vulnerability (23 of 100) .