Overview

Distribution

Range Description

This species is only known form the type locality, though the distribution is likely to be much wider in the middle and lower Paraná River, and in marshlands in Chaco and Formosa, Argentina.
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Paraná River basin, Argentina.
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South America: Paraná River basin.
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Physical Description

Size

Max. size

3.1 cm SL (male/unsexed; (Ref. 38376))
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
H. wajat is a benthopelagic (ecological region at the lowest level of water body) species. Type locality is an inundated area. Species occurs in slow flowing areas of water, associated with submerged vegetation.

Systems
  • Freshwater
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Environment

benthopelagic; freshwater
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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
Reis, R & Lima, F.

Reviewer/s
Collen, B., Darwall, W., Ram, M. & Smith, K. (SRLI Freshwater Fish Evaluation Workshop)

Contributor/s

Justification
This species is only known from its type locality and has therefore been assessed as Least Concern. The range of this species maybe wider throughout the basin. However, there are threats to the area in which H. wajat lives.
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Population

Population
No population information known.

Population Trend
Unknown
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Threats

Major Threats
A major threat to the 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). However, these threats are greater in the upper Paraná basin. The lower part of the basin has a very low human population and large parts of it are still in a rather pristine condition (Junk 2005).

Unlikely to be threatened to a large extent because the specific area occupied by the species has a relative low human presence.
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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
There are no conservation measures in place and research into the population trends are required.
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