分類 / 名前
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Characiformes (Characins) >
Acestrorhamphidae (American tetras) > Incertae sedis
Etymology: Gymnocharacinus: Greek, gymnos = naked + Greek, charax = the name of a fish (Ref. 45335).
Eponymy: Dr Frederico Guillermo ‘Carlos’ (Friedrich Wilhelm Carl) Berg (1843–1902) was a Latvian entomologist and naturalist. [...] (Ref. 128868), visit book page.
More on author: Steindachner.
Taxonomic Remarks
Illustrated and described in more detail in Steindachner, 1903:18 Pl. 1 (fig. 2). See Géry, 1977:535 and CEAL, 1988:8 for comments. Common names according to Axelrod et al., 1991:1115 and Ortubay & Cussac, 2000:144. Threatened species according to Ortubay & Cussac, 2000:144.
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. Subtropical; 22°C - 26°C (Ref. 35685); 35°S - 36°S
South America: Valcheta stream in Rio Negro basin, Southern Argentina.
初回成熟時の長さ / サイズ / 重さ / 年齢
成熟: Lm 3.8  range ? - ? cm
Max length : 7.5 cm TL オス/雌雄の選別がない; (Ref. 38376)
簡単な記述
検索表 | 形態学 | 形態計測学
背面の脊椎 (合計) : 0; 背鰭 (合計) : 12; 肛門の骨: 0; 臀鰭: 19. Entirely naked (scale only shown on lateral line in specimens > 5 cm TL; head profile obtuse. Color is dark brown, greenish, the belly is cream; there is a copper-colored band on the flanks (Ref. 35685).
Body shape (shape guide): elongated.
Medium sized fish considered to be the most southern characid living in temperate waters. Young with very tiny soft and delicate scales which are reabsorbed into the skin making the skin greasy and often with granulated or spongy appearance (Ref. 7252).
ライフサイクルと交尾行動
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Ortubay, S. and V. Cussac, 2000. Threatened fishes of the world: Gymnocharacinus bergi Steindachner, 1903 (Characidae). Environ. Biol. Fishes 58:144. (Ref. 35685)
IUCNのレッドリストの状況は (Ref. 130435: Version 2025-2 (Global))
絶滅寸前の危機的状況 (CR) (B1ab(i,ii,iii,iv)+2ab(i,ii,iii,iv)); Date assessed: 29 August 2017
人間の用途
水産業: 興味がない; 水族館・水槽: 商業
用具
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 = 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.00389 (0.00180 - 0.00842), b=3.12 (2.94 - 3.30), in cm total length, based on all LWR estimates for this body shape (Ref. 93245). |
栄養段階 (参照 69278) |
3.1 ±0.4 se; based on size and trophs of closest relatives |
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Generation time |
1.7 ( na - na) years. Estimated as median ln(3)/K based on 2 growth studies. |
回復力 (参照 120179) |
高い, 15か月以下の倍増期間の最小個体群 (tm=1). |
漁業の脆弱性 (Ref. 59153) |
Low vulnerability (22 of 100). 🛈 |