分類 / 名前
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Gymnotiformes (Knifefishes) >
Gymnotidae (Naked-back knifefishes) > Gymnotinae
Etymology: Gymnotus: Greek, gymnos = naked (Ref. 45335); jonasi: Named in honor of Jonas Alves de Oliveira, a Brazilian naturalist working for the Mamirauá Sustainable Development Reserve (Ref. 41292).
Eponymy: Jonas Alves de Oliveira is a naturalist and technician at Mamirauá Sustainable Development Reserve, Amazonas, Brazil. He co-wrote: Chromosomal diversity in three species of electric fish (Apteronotidae, Gymnotiformes) from the Amazon Basin (2014). (Ref. 128868), visit book page.
環境:環境 / 気候帯 / 深さの範囲 / 分布範囲
生態学
; 新鮮な水 底生の漂泳性. Subtropical
South America: Amazon River basin, Brazil.
サイズ / 重さ / 年齢
成熟: Lm ?  range ? - ? cm
Max length : 13.5 cm TL オス/雌雄の選別がない; (Ref. 41292); 最大公表体重: 4.00 g (Ref. 41292)
簡単な記述
検索表 | 形態学 | 形態計測学
Electric organs present.
Facultative air-breathing in the genus (Ref. 126274); Recorded from root mass of floating meadows in the whitewater floodplains of the Tefé region where it is common although patchy in distribution. Adults both breed and forage in the meadows and are never encountered in other floodplain habitats such as flooded forests. Both juveniles and adults feed on small aquatic animals, especially chironomid larvae (Ref. 41292).
ライフサイクルと交尾行動
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
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のレッドリストの状況は (Ref. 130435: Version 2025-2 (Global))
人間の用途
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特記事項
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インターネットの情報源
モデルに基づく推定値
系統多様性指数 (参照 82804) |
PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00427 (0.00202 - 0.00902), b=2.98 (2.79 - 3.17), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245). |
栄養段階 (参照 69278) |
2.5 ±0.50 se; based on food items. |
回復力 (参照 120179) |
高い, 15か月以下の倍増期間の最小個体群 (Preliminary K or Fecundity.). |
漁業の脆弱性 (Ref. 59153) |
Low vulnerability (13 of 100). 🛈 |