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Astyanax trierythropterus

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA ACTINOPTERYGII CHARACIFORMES CHARACIDAE

Scientific Name: Astyanax trierythropterus
Species Authority: Godoy, 1970

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2c; B1ab(i,iii,iv) ver 3.1
Year Published: 2009
Date Assessed: 2007-03-01
Assessor(s): Reis, R & Lima, F.
Reviewer(s): Collen, B., Darwall, W., Ram, M. & Smith, K. (SRLI Freshwater Fish Evaluation Workshop)
Justification:
Assessed as Vulnerable due to an inferred population decline of greater than 30% over the past ten years. This is due to an increase in water pollution in the upper Paraná River basin but also because of continuing decline in habitat area and quality. It is suspected that populations of A. trierythropterus may have also become fragmented due to the construction of many dams within their range. With an estimated Extent of Occurrence of less than 12,000 km², this species also qualifies under B1ab(i,iii,iv) due to the threats listed above on its preferred habitats.

Geographic Range [top]

Range Description: This species occurs in the upper Paraná River basin, Brazil. The species is only known form its type locality of the Mogi-Guaçu River basin. More specimens have been collected from the type locality, though not from elsewhere. It is probable that the species occurs more broadly, but collection attempts have not been made.
Countries:
Native:
Brazil (Goiás, Mato Grosso, Minas Gerais, Paraná, São Paulo)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The global population is decreasing, although detailed information is not yet available.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: A. trierythropterus is a benthopelagic (ecological region at the lowest level of water body) species. Occurs in ponds and small lakes near the flood plain areas.
Systems: Freshwater

Threats [top]

Major Threat(s): Damming of the upper Paraná River in Jupia has seriously affected the aquatic environment. There are over 130 dams in the region, which affect virtually all the principle tributaries. The dam interrupts the migration of many species that travel upstream to reproduce (Agostinho and Gomes 2001). However, it is not known how this would have specifically affected A. trierythropterus.

The major threat in the upper and middle Paraná basin is degradation in the quality of the basin's water resources, due to the disposal of untreated domestic and industrial effluents. The Paraná basin has the highest urban-industrial density in the inner country. The presence of herbicides and fungicides used in farming and cattle-rearing development may also become a considerable source of pollution. The construction of Itaipu, Rosana and Taquaracu hydroelectric power plants has attracted more people to the region to work (Diegues 1994).

Conservation Actions [top]

Conservation Actions: There are no conservation measures in place although they are needed. Surveys into the habitat status and population numbers are needed, plus information on the affects of the known threats (dam construction and increase in water pollution) are necessary on the hope that A. trierythropterus can be down listed in the future.

Citation: Reis, R & Lima, F. 2009. Astyanax trierythropterus. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 22 October 2014.
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