分類 / Names
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Characiformes (Characins) >
Characidae (Characins; tetras) > Stevardiinae
Etymology: Knodus: Greek, knodon, -ontos = knife, sword (Ref. 45335); geryi: Named after Jacques Géry, in recognition of his enormous contribution to the knowledge of the characiform fishes.
Eponymy: Dr Jacques Géry (1917– 2007) was a French physician and ichthyologist. [...] (Ref. 128868), visit book page.
Environment: milieu / climate zone / depth range / distribution range
生態学
; 新鮮な水 底生の漂泳性. Tropical
South America: rio do Peixe in the upper rio Paraguay basin, Brazil.
サイズ / 重さ / 年齢
Maturity: Lm ? range ? - ? cm
Max length : 6.5 cm SL オス/雌雄の選別がない; (Ref. 55831)
簡単な記述
検索表 | 形態学 | 形態計測学
背鰭 (合計) : 10; 臀鰭: 18 - 20; 脊つい: 38 - 39. Differs from all congeners and from all remaining characid fishes by having two symmetric, large dark blotches basally on caudal fin lobes (Ref. 55831).
Inhabits small river with transparent waters, very channeled and relatively deep (> 2 m deep in some points), having both rapids and waterfalls (Ref. 55831). Feeds on vegetal matter and insects (Ref. 55831).
Life cycle and mating behavior
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Lima, F.C.T., H.A. Britski and F.A. Machado, 2004. New Knodus (Ostariophysi: Characiformes: Characidae) from the upper Rio Paraguay basin, Brazil. Copeia 2004(3):577-582. (Ref. 55831)
IUCNのレッドリストの状況は (Ref. 130435: Version 2024-1)
Human uses
水産業: 興味がない
用具
特記事項
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インターネットの情報源
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=0.00912 (0.00496 - 0.01677), b=3.03 (2.87 - 3.19), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
栄養段階 (Ref.
69278): 3.2 ±0.40 se; based on food items.
回復力 (Ref.
120179): 高い, １５か月以下の倍増期間の最小個体群 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
