分類 / Names
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Clupeiformes (Herrings) >
Ehiravidae (River sprats)
Etymology: Sauvagella: Because of Sauvage, 1860-1880 and 1875-1891; ichtyologist that studied the Ogowe; author of "Histoire naturelle des poissons de Madagascar"; robusta: Named in reference to the deep body of the species, which is evident even in the juvenile specimens (Ref. 33664).
Environment: milieu / climate zone / depth range / distribution range
生態学
; 新鮮な水 外洋の; pH range: ? - 8.3. Tropical
Africa: Sofia River drainage in Madagascar (Ref. 33664, 121308).
サイズ / 重さ / 年齢
Maturity: Lm ? range ? - ? cm
Max length : 4.7 cm SL オス/雌雄の選別がない; (Ref. 33664)
背面の脊椎 (合計) : 0; 背鰭 (合計) : 11 - 15; 肛門の骨: 0; 臀鰭: 13 - 17; 脊つい: 38 - 40. Diagnosis: Body relatively elongate; belly rounded, without pre-pelvic scutes, but a pelvic scute present with slender lateral arms; gillrakers reduced in number, 15-19 gillrakers on lower limb of first arch; pelvic fin with 1 unbranched and 7 branched finrays, a little anterior to dorsal fin origin; last two anal finrays not separate from others (Ref. 33664). It is distinguished from Sauvagella madagascariensis by lower vertebral number, 38-40 vs. 41-43; deeper body, 20.8-27.4% of standard length vs. 15.8-21.1%; a shorter snout, 18.5-26.6% of head length vs. 26.2-33.7%; and a lower anal fin ray count, 13-17 vs. 17-19 (Ref. 33664).
Found in a river flowing over a rock and sand bed and forming numerous small rapids alternating with quieter pools (Ref. 33664). The apparently restricted distribution of this species combined with ongoing deforestation and erosional situation within the river basin will inevitably increase stress on the habitat rendering the species vulnerable to future decline (Ref. 33664).
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 幼生
Stiassny, M.L.J., 2002. Revision of Sauvagella Bertin (Clupeidae; Pellonulinae; Ehiravini) with a description of a new species from the freshwaters of Madagascar and diagnosis of the Ehiravini. Copeia 2002(1):67-76. (Ref. 33664)
IUCNのレッドリストの状況は (Ref. 130435)
絶滅危惧 (EN) (B2ab(iii)); Date assessed: 29 June 2016
Human uses
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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 = 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00468 (0.00188 - 0.01164), b=3.03 (2.82 - 3.24), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
栄養段階 (Ref.
69278): 3.1 ±0.3 se; based on size and trophs of closest relatives
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).
