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Elasmobranchii (sharks and rays) > Myliobatiformes (Stingrays) > Potamotrygonidae (River stingrays) > Potamotrygoninae
Etymology: Plesiotrygon: Greek, plesios = near + Greek, trygon = a sting ray (Ref. 45335); iwamae: Named in honor of the late Brazilian zoologist Satoko Iwama (Ref. 34195).

Issue
Food items consist of fishes (e.g. catfishes), insects, crustaceans and nematodes (Rosa et al., 1987). Nothing is known of its reproductive biology, but pups are free-swimming at least by 12 cm DL. Recent references: Barriga (1991), Wilkens & Dohse (1993), Compagno & Cook (1995), Lovejoy (1996).

Environment: milieu / climate zone / depth range / distribution range Ecology

Freshwater; demersal. Tropical

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

South America: Upper to lower Amazon River basin, from Ecuador to Belém, Brazil, in the Napo, Solimões, Amazonas and Pará rivers.

Size / Weight / Age

Maturity: L_m ? range ? - ? cm
Max length : 58.0 cm WD male/unsexed; (Ref. 34195)

Feeds on small catfishes, insects, decapod crustaceans, and parasitic cestodes and nematodes (Ref. 34195).

Life cycle and mating behavior Maturities | Reproduction | Spawnings | Egg(s) | Fecundities | Larvae

Main reference Upload your references | References | Coordinator : Carvalho, Marcelo | Collaborators

Rosa, R.S., H.P. Castello and T.B. Thorson, 1987. Plesiotrygon iwamae, a new genus and species of neotropical freshwater stingray (Chondrichthyes: Potamotrygonidae). Copeia 1987(2):447-458. (Ref. 34195)

IUCN Red List Status (Ref. 130435)

Vulnerable (VU) (A2cd); Date assessed: 29 March 2021

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

Harmless

Human uses

FAO - Publication: search | FishSource |

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Trophic ecology
Food items
Diet compositions
Food consumptions
Food rations
Predators

Ecology
Ecology

Population dynamics
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Length-weight rel.
Length-length rel.
Length-frequencies
Mass conversions
Recruitments
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Life cycle
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Maturities
Fecundities
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Egg(s)
Egg developments
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Anatomy
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Brains
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Physiology
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Visual pigment(s)
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Estimates based on models

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.7500 [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): 3.4 ±0.46 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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Plesiotrygon iwamae Rosa, Castello & Thorson, 1987