分类 / Names
俗名 | 同种异名 | Catalog of Fishes(属, 种) | ITIS | CoL | WoRMS | Cloffa
Teleostei >
Gymnotiformes (Knifefishes) >
Gymnotidae (Naked-back knifefishes) > Gymnotinae
Etymology: Gymnotus: Greek, gymnos = naked (Ref. 45335); obscurus: Name from the Latin word 'obscurus' meaning dark, referring to its predominantly dark coloration.
Environment: milieu / climate zone / depth range / distribution range
生态学
; 淡水 底中水层性. 热带
South America: varzea floodplain at the conflluence of the Rio Solimoes (Amazon) and the Rio Japura in Mamiraua Reserve near the Tefé, Amazonas, Brazil.
南美洲: varzea 洪泛区在 Mamiraua 的 Rio Solimoes(亚马孙河) 的 conflluence 与 Rio Japura 在 Tefe ， Amazonas 巴西的附近预订。
大小 / 重量 / 年龄
Maturity: Lm ? range ? - ? cm
Max length : 21.5 cm TL 雄鱼/尚未辨别雌雄; (Ref. 55508)
简单描述
检索表 | 型态特徵 | 形态测量图
背棘 (总数) : 0; 背的软条 (总数) : 0; 臀鳍软条: 210 - 250. Distinguished from its congeners endemic to the Amazon and Orinoco Basins and the Guyana Shield in having many pectoral-fin rays 20-22; and a color pattern of oblique and undivided thin pale bands, less than one-quarter width of dark bands, with straight high-contrast margins, which extend to the dorsal midline on the anterior half of the body, and of which many are interrupted at the ventral margin of the hypaxial muscles along the anterior two-thirds of the body. Differs further from congeners endemic to the Amazon-Orinoco basins and the Guyana Shield in having the following unique combination of characters: clear (unpigmented) patch at the caudal end of the anal-fin membrane in specimens 6.0-23.5 TL; and bands never divided to form band pairs (Ref. 55508).
与它的同类区分了亚马孙河的特有种与奥里诺科河流域，而且盖亚那盾甲有许多胸鳍鳍条 20-22; 而且一个斜与未分开细的灰白条纹的彩色斑纹,少于深色条纹的四分之一宽度,有直的高度地对比的边缘, 在身体前半部上延伸到背部中线, 与那一个多数在轴前肌肉的下缘被中断沿着前面的身体中的三分之二。 进一步不同于同类亚马孙河-奥里诺科河的流域的特有种，而且盖亚那盾甲有下列的独特组合特征: 在臀鳍薄膜的尾鳍末端在标本 6.0-23.5 TL 的清澈的 (没有颜色) 小区块; 而且条纹从不分开形成条纹对.(参考文献 55508)
Facultative air-breathing in the genus (Ref. 126274); Inhabits root mats of floating meadows in floodplains. In the whitewater floodplain, juveniles are encountered in patches of floating macrophytes along lakes margins and along the edge of canos (drainage channels from lakes to the main river channels) and paranás (channels connected at both ends to the main river channel that transport whitewater through the floodplain). Floating macrophytes form extensive floating meadows. Undertakes aerial respiration by gulping atmospheric air into the hypervascularized posterior chamber of the gas bladder. Feeds primarily on chironomid larvae, small insect nymphs and small crustaceans (Ref. 55508).
在洪泛区中栖息于漂浮草地的簇根。 在白水的洪泛区中，稚鱼在漂浮大型植物的区块被见到沿着湖边缘而且沿着 canos(来自湖到主要部份河道的流域峡道) 与 paranas 的边缘.(在两者的末端到主要部份河峡道连接的峡道哪一传送白水的经过洪泛区) 漂浮大型植物形成广泛的漂浮草地。 进行藉由吞大气的空气进入气鳔的 hypervascularized 后室呼吸空气。 主要吃宝刀鱼仔鱼，小的昆虫蛹与小型甲壳动物。 (参考文献 55508)
Life cycle and mating behavior
成熟度 | 繁殖 | 产卵场 | 卵 | 孕卵数 | 仔鱼
南美洲: varzea 洪泛区在 Mamiraua 的 Rio Solimoes(亚马孙河) 的 conflluence 与 Rio Japura 在 Tefe ， Amazonas 巴西的附近预订。
Crampton, W.G.R., D.H. Thorsen and J.S. Albert, 2005. Three new species from a diverse, sympatric assemblage of the electric fish Gymnotus (Gymnotiformes: Gymnotidae) in the lowland Amazon basin, with notes on ecology. Copeia 2005(1):82-99. (Ref. 55508)
世界自然保护联盟红皮书 (Ref. 130435: Version 2024-2)
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 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).
营养阶层 (Ref.
69278): 3.3 ±0.4 se; based on size and trophs of closest relatives
回复力 (Ref.
120179): 高度, 族群倍增时间少于 15个月 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (12 of 100).
