Overview

Comprehensive Description

Biology

After a gestation period of about 20 weeks two pups were born in a public aquarium (Ref. 57489).
  • Compagno, L.J.V. 1999 Checklist of living elasmobranchs. p. 471-498. In W.C. Hamlett (ed.) Sharks, skates, and rays: the biology of elasmobranch fishes. John Hopkins University Press, Maryland. (Ref. 35766)
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Distribution

Range Description

Northeastern Argentina, central Paraguay, Western of Brazil in Mato Grosso found in Rio Cuiabá, Rio Paraguay, and in Rio Paraná (Middle and High) from Guaíra to Entre Rios (Rosa 1985). In Alto Paraná the species is found at Puerto San Jorge and in the Mouth of Uruguay River (Missiones) (Castex 1964, Castex and Maciel 1965).
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Range Description

South America inland waters: known from the Paraná and Paraguay River basins in Argentina, Paraguay and Brazil. This species is probably not present in the Amazon drainage (Guaporé, Beni, Solimões and Marañón River) and reports from Peru and Bolivia (Rosa 1985, Carvalho et al. 2003, Araújo et al. 2004 and others) probably correspond to misidentification with similar species (author's personal observations).
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South America: Paraná-Paraguay River basin, from Cuiabá and Piquiri rivers (among others) to the La Plata River.
  • de Carvalho, M.R., N. Lovejoy and R.S. Rosa 2003 Potamotrygonidae (River stingrays). p. 22-28. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil. (Ref. 36687)
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Paraná-Paraguay River basin: Argentina, Brazil and Paraguay.
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Upper Amazon River and Paraná-Paraguay River basins: Argentina, Bolivia, Brazil and Peru.
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Physical Description

Size

Max. size

60.0 cm WD (male/unsexed; (Ref. 36687))
  • de Carvalho, M.R., N. Lovejoy and R.S. Rosa 2003 Potamotrygonidae (River stingrays). p. 22-28. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil. (Ref. 36687)
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
There is very little information on the biology or ecology of this species. It inhabits deeper waters in channels with strong current (Castex 1965a in Rosa 1985). Maximum size 485 mm disc width (DW) and 892 mm of total length (TL) (Castex and Maciel 1963).

Systems
  • Freshwater
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Habitat and Ecology

Habitat and Ecology
With respect to habitat, ecology and biology, the original description (Castello and Yagolkowski 1969) only mentions that the holotype and paratypes were captured in a lagoon and that sexual heterodonty was absent. There are no further data available concerning habitat and life history aspects of this species.

Systems
  • Freshwater
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Environment

benthopelagic; freshwater
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Life History and Behavior

Life Cycle

After a pregnancy of about 20 weeks two pups were born in the John-Shedd-Aquarium, New York.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Potamotrygon falkneri

The following is a representative barcode sequence, the centroid of all available sequences for this species.


No available public DNA sequences.

Download FASTA File
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Statistics of barcoding coverage: Potamotrygon falkneri

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 4
Specimens with Barcodes: 8
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
DD
Data Deficient

Red List Criteria

Version
3.1

Year Assessed
2009

Assessor/s
Góes de Araújo, M.L.

Reviewer/s
Kyne, P.M., Cavanagh, R.D. & Fowler, S.L. (Shark Red List Authority)

Contributor/s

Justification
The Reticulated Freshwater Stingray (Potamotrygon falkneri) is a little known freshwater stingray from the Paraná River basin. There is essentially no information available on this species' ecology or biology. As other potamotrygonids, it faces numerous identified threats including habitat degradation and fishing activities. Further evaluation when more information available will be required to assess this species beyond Data Deficient.
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IUCN Red List Assessment


Red List Category
DD
Data Deficient

Red List Criteria

Version
3.1

Year Assessed
2009
  • Needs updating

Assessor/s
Charvet-Almeida, P. & Pinto de Almeida, M.

Reviewer/s
Kyne, P.M., Cavanagh, R.D. & Fowler, S.L. (Shark Red List Authority)

Contributor/s

Justification
The Vermiculate River Stingray (Potamotrygon castexi) is a medium size freshwater stingray from the Paraná and Paraguay River basins. There is no information available on the life history or population trends for this species. Environmental degradation and habitat loss are probably among the main threats. It does not appear to be taken as a food source, and is not often captured for the ornamental trade. Baseline research actions and habitat conservation are needed for this species. A revised assessment is recommended at such time as further information is available.
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Population

Population
Unknown.

Population Trend
Unknown
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Population

Population
Population size and dynamics have never been estimated and are unknown for this species.

Population Trend
Unknown
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Threats

Major Threats
Fishing activities and habitat degradation caused by the damming of the Rio Paraná system for navigation and hydroelectric plants, and the construction of many ports along the river.
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Major Threats
The threats facing this species are not well known. Environmental impacts, including habitat loss and degradation due to infrastructure development, agriculture and water pollution (agricultural wastes) seem to be among the main threats for P. castexi. There are no catch records and apparently this species is not used as a food source, nor often captured for the ornamental trade. International trade information indicates that this species is marketed (Araújo et al. 2004) but quantitative information is not available.
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Data deficient (DD)
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Management

Conservation Actions

Conservation Actions
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Conservation Actions

Conservation Actions
Research actions to obtain baseline information are necessary to establish adequate conservation measures. Habitat conservation and impact mitigation measures are potentially important for the conservation of this species. Adequate management and legislation should be addressed. Education and public awareness are desired due to the negative image associated to this group of elasmobranchs due to fear of sting accidents often leading to persecution.
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: of no interest; aquarium: show aquarium
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