Fontitrygon garouaensis, Smooth freshwater stingray : fisheries

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Fontitrygon garouaensis (Stauch & Blanc, 1962)

Smooth freshwater stingray
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Fontitrygon garouaensis
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分類 / Names 共通名の | 類義語 | Catalog of Fishes(部類, ) | ITIS | CoL | WoRMS | Cloffa

板鰓亜鋼(サメとエイ類) (sharks and rays) > Myliobatiformes (Stingrays) > Dasyatidae (Stingrays) > Urogymninae
Etymology: garouaensis: Named for its geographical localization (Ref. 39828).

Environment: milieu / climate zone / depth range / distribution range 生態学

; 新鮮な水 底生の.   Tropical

分布 国々 | 国連食糧農業機関の区域 | エコシステム | 事件 | Point map | 導入 | Faunafri

Africa: Benue River in Cameroon and Nigeria, and Niger River downstream from its confluence with the Benue River (Ref. 3497, 81259). Also reported from Lagos Lagoon, Cross River and Sanaga River (Ref. 81259, 81625).

サイズ / 重さ / 年齢

Maturity: Lm ?  range ? - ? cm
Max length : 40.0 cm WD オス/雌雄の選別がない; (Ref. 3497)

簡単な記述 形態学 | 形態計測学

脊つい: 120 - 131. Diagnosis: A moderately large and thin-bodied freshwater dasyatid; disc flatter than in any other West African dasyatid, its depth only 8.7-11.0% of disc width vs. 11.0% or more in other species; denticles on dorsal surface of disc highly variable, sometimes absent, always restricted to central portion; pearl spine absent or represented by 2-3 low denticles (Ref. 26277). It is most similar to the small marine species Dasyatis margaritella and the larger marine species Dasyatis margarita, both of which have well-developed pearl spines and shorter snouts (Ref. 26277).

生物学     用語集 (例 epibenthic)

Dasyatis garouaensis is restricted to fresh waters (Ref. 81625). Its conservation status is uncertain, given its restricted distribution in a region with known habitat degradation; this species has apparently become less common after the construction of a dam on the Benue River (Ref. 81625). Ovoviviparous (Ref. 50449).

Life cycle and mating behavior 成熟 | 繁殖 | 放精 | | 生産力 | 幼生

Exhibit ovoviparity (aplacental viviparity), with embryos feeding initially on yolk, then receiving additional nourishment from the mother by indirect absorption of uterine fluid enriched with mucus, fat or protein through specialised structures (Ref. 50449). Distinct pairing with embrace (Ref. 205).

主な参考文献 Upload your references | 参考文献 | コーディネーター : McEachran, John | 協力者

Compagno, L.J.V. and T.R. Roberts, 1984. Dasyatidae. p. 4-5. In J. Daget, J.P. Gosse and D.F.E. Thys van den Audenaerde (eds.) Check-list of the freshwater fishes of Africa (CLOFFA). ORSTOM, Paris and MRAC, Tervuren. Vol. 1. (Ref. 3497)

IUCNのレッドリストの状況は (Ref. 123251)

  攻撃されやすい (VU) (B1ab(iii,iv,v); C2a(ii)); Date assessed: 03 October 2005

CITES (Ref. 123416)

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

人間に対する脅威

  Harmless





Human uses

水産業:
FAO - Publication: search | FishSource |

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シガテラ(食中毒の名前)
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Estimates based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5156   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00813 (0.00359 - 0.01840), b=3.11 (2.90 - 3.32), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
栄養段階 (Ref. 69278):  3.7   ±0.3 se; based on size and trophs of closest relatives
回復力 (Ref. 120179):  非常に低い, 14年以上の倍増期間の最小個体群 (Assuming Fec<10).
弱み (Ref. 59153):  Very high vulnerability (90 of 100) .
価格帯 (Ref. 80766):   Low.