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Potamotrygon orbignyi, Smooth back river stingray
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Smooth back river stingray
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Potamotrygon orbignyi
Picture by
Landines, M.
Classification / Names
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| Catalog of Fishes(
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,
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) |
ITIS
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Cloffa
Elasmobranchii (sharks and rays) >
Myliobatiformes
(Stingrays) >
Potamotrygonidae
(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
Ecology
Freshwater; benthopelagic; pH range: 6.8 - 7.5. Tropical; 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.
Size / Weight / Age
Maturity: L
m
 
?
  range ? - ? cm
Max length : 35.0 cm WD male/unsexed; (Ref.
27749
); 32.5 cm WD (female); max. published weight: 1.4 kg (Ref.
27749
); max. published weight: 1.4 kg
Occurs in stream swamps, floodplain lakes and artificial lagoons. Feeds mainly on insects and benthic crustaceans (Ref.
27749
).
Life cycle and mating behavior
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|
Reproduction
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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
)
IUCN Red List Status (Ref.
130435
)
Least Concern (LC)
; Date assessed:
24 June 2003
CITES
Appendix III:
International trade cooperation
Not Evaluated
Threat to humans
Harmless
Human uses
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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
).
Trophic level (Ref.
69278
): 3.2 ±0.43 se; based on food items.
Resilience (Ref.
120179
): Very Low, minimum population doubling time more than 14 years (Assuming Fec <10).
Fishing Vulnerability (Ref.
59153
): High vulnerability (58 of 100).
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