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Teleostei >
Clupeiformes (Herrings) >
Dorosomatidae (Gizzard shads and sardinellas)
Etymology: Thrattidion: Diminutive of Greek, thratta, -es = a kind of fish (Ref. 45335).
More on author: Roberts.
Environment: milieu / climate zone / 深度上下限 / distribution range
生態學
; 淡水 大洋性. 熱帶; 6°N - 3°N
Africa: Sanaga River in Cameroon (Ref. 188, 3509, 28136, 81631).
非洲: 在喀麥隆的 Edea 的沙那加河的特有種。
大小 / 重量 / 年齡
成熟度: Lm ? range ? - ? cm
Max length : 2.1 cm SL 雄魚/尚未辨別雌雄; (Ref. 188)
背棘 (總數) : 0; 背的軟條 (總數) : 14 - 16; 臀棘: 0; 臀鰭軟條: 23 - 25; 脊椎骨: 45 - 47. Diagnosis: Small and slender or moderately deep-bodied fishes, its depth 20-28% of standard length, perhaps not reaching much over 2 cm standard length; belly rounded, pre-pelvic scutes 4-7, with lateral arms, but without keels; pelvic scute with 2 or 3 lateral arms; post-pelvic scutes 3-5, keeled and with arms; posterior supra-maxilla absent; lower gillrakers 10-12; pelvic insertion well before dorsal fin, with 1 unbranched and 6-7 branched finrays; anal fin beginning under dorsal fin base (Ref. 188, 81631, 93833). The presence of scutes distinguishes Thrattidion noctivagus from Congothrissa gossei and the absence of a posterior supra-maxilla distinguishes it from all other West or Central African pellonulines (Ref. 188).
Body shape (shape guide): fusiform / normal; Cross section: oval.
也許不多超過 2 公分標準長度。 前腹鰭鱗甲 4 到 7, 藉由側面的手臂, 但是沒有龍骨脊; 用 2 或 3 側面的手臂腹鰭鱗甲; 在腹鰭之後的鱗甲龍骨了與具有手臂; 臀鰭在背鰭基底下面開始。 那有鱗甲區別它和 Congothrissa gossei; 從所有的其他西方或中非 pellonulines 藉由缺少一個第二個上顎骨。
A riverine species, collected only at dusk and dawn in swiftly flowing water of about 1 m just above the hydro-electric dam at Edea, Cameroon (Ref. 188). It feeds on plankton and some terrestrial insects (Ref. 188).
一個河棲性魚種, 在喀麥隆的 Edea 在水力發電的水壩的正上方在大約 1 公尺的很快流動水只在薄暮與破曉採集到了。 吃浮游生物與一些陸棲的昆蟲。
Life cycle and mating behavior
成熟度 | 繁殖 | 產卵場 | 卵 | 孕卵數 | 仔魚
非洲: 在喀麥隆的 Edea 的沙那加河的特有種。
Teugels, G.G., 2007. Clupeidae. p. 186-204. In M.L.J. Stiassny, G.G. Teugels and C.D. Hopkins (eds.) The fresh and brackish water fishes of Lower Guinea, West-Central Africa. Volume I. Collection Faune et Flore tropicales 42. Institut de Recherche pour le Développement, Paris, France, Muséum National d’Histoire Naturelle, Paris, France, and Musée Royal de l’Afrique Centrale, Tervuren, Belgium. 800 pp. (Ref. 81631)
IUCN 瀕危狀態 (Ref. 130435: Version 2025-1)
人類使用
漁業: 沒有興趣
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Estimates based on models
Phylogenetic diversity index (參考文獻
82804): PD
50 = 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00871 (0.00415 - 0.01826), b=3.06 (2.89 - 3.23), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
營養階層 (參考文獻
69278): 3.3 ±0.42 se; based on food items.
回復力 (參考文獻
120179): 高度, 族群倍增時間少於 15個月 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
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