分類 / Names
俗名 | 同種異名 | Catalog of Fishes(屬, 種) | ITIS | CoL | WoRMS | Cloffa
Elasmobranchii
板鰓亞綱 (鯊魚與魟魚) (sharks and rays) >
Myliobatiformes (Stingrays)
鰩目 (Stingrays) >
Potamotrygonidae (River stingrays)
河魟科 (River stingrays) > Potamotrygoninae
Etymology: Potamotrygon: Greek, potamos = river + Greek, trygon = a sting ray (Ref. 45335).
More on author: Castelnau.
Issue
A widespread species that may require subdivision. Rosa (1985a) recognizes Potamotrygon dumerilli (Castelnau 1855) and Potamotrygon humerosus Garman 1913 as distinct species, but evidence given is meager. Larger specimens may weigh close to five kg. Reproductive biology studied by Lasso et al. (1997a) in Venezuela; males achieve sexual maturity at 23 cm DL and females at 18.5 cm DL, and females give birth to up to two pups during any time of year. Food consists of fishes, insects and crustaceans. Additional references: Bertin (1939), Sérét & McEachran (1986), Compagno & Cook (1995), Planquette et al. (1996).
Environment: milieu / climate zone / depth range / distribution range
生態學
; 淡水 底中水層性; pH range: 6.8 - 7.5. 熱帶; 24°C - 26°C (Ref. 12468)
South America: Widespread in Amazon and Orinoco River basins and in river systems in Suriname, Guyana and French Guiana.
南美洲: 廣泛分佈於亞馬遜河與奧里諾科河河流域與在蘇利南，蓋亞那與法屬圭亞那的河流域。
大小 / 重量 / 年齡
Maturity: Lm ? range ? - ? cm
Max length : 35.0 cm WD 雄魚/尚未辨別雌雄; (Ref. 27749); 32.5 cm WD (female); 最大體重: 1.4 kg (Ref. 27749); 最大體重: 1.4 kg
Occurs in stream swamps, floodplain lakes and artificial lagoons. Feeds mainly on insects and benthic crustaceans (Ref. 27749).
出現於水流沼澤，洪泛區湖與人造的潟湖。 主要吃昆蟲與底棲的甲殼動物。 (參考文獻 27749)
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 仔魚
南美洲: 廣泛分佈於亞馬遜河與奧里諾科河河流域與在蘇利南，蓋亞那與法屬圭亞那的河流域。
Lasso, C.A., A. Rial B. and O. Lasso-Alcalá., 1997. Notes on the biology of the freshwater stingrays Paratrygon aiereba (Müller & Henle, 1841) and Potamotrygon orbignyi (Castelnau, 1855) (Chondrichthyes: Potamotrygonidae) in the Venezuelan Llanos. aqua, J. Ichthyol. Aquat. Biol. 2(3):39-52. (Ref. 27749)
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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=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
營養階層 (Ref.
69278): 3.2 ±0.43 se; based on food items.
回復力 (Ref.
120179): 非常低的, 最小族群倍增時間超過14 年 (Assuming Fec <10).
Fishing Vulnerability (Ref.
59153): High vulnerability (58 of 100).
