Overview

Comprehensive Description

Biology

Medium sized fish considered to be the most southern characid living in temperate waters. Young with very tiny soft and delicate scales which are reabsorbed into the skin making the skin greasy and often with granulated or spongy appearance (Ref. 7252).
  • Ortubay, S. and V. Cussac 2000 Threatened fishes of the world: Gymnocharacinus bergi Steindachner, 1903 (Characidae). Environ. Biol. Fish. 58:144. (Ref. 35685)
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Distribution

South America: Valcheta stream in Rio Negro basin, Southern Argentina.
  • Ortubay, S. and V. Cussac 2000 Threatened fishes of the world: Gymnocharacinus bergi Steindachner, 1903 (Characidae). Environ. Biol. Fish. 58:144. (Ref. 35685)
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Valcheta Creek, Somuncurá Plateau, Negro River dranage, southern Argentina.
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Physical Description

Morphology

Dorsal spines (total): 0; Dorsal soft rays (total): 12; Analspines: 0; Analsoft rays: 19
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Size

Maximum size: 90 mm TL
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Max. size

7.5 cm TL (male/unsexed; (Ref. 38376))
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Diagnostic Description

Entirely naked (scale only shown on lateral line in specimens > 5 cm TL; head profile obtuse. Color is dark brown, greenish, the belly is cream; there is a copper-colored band on the flanks (Ref. 35685).
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Ecology

Habitat

Habitat and Ecology

Systems
  • Freshwater
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Environment

demersal; freshwater
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
EN
Endangered

Red List Criteria
A2ce, B1+2c

Version
2.3

Year Assessed
1996
  • Needs updating

Assessor/s
World Conservation Monitoring Centre

Reviewer/s

Contributor/s

History
  • 1996
    Endangered
    (Baillie and Groombridge 1996)
  • 1996
    Endangered
  • 1994
    Vulnerable
    (Groombridge 1994)
  • 1990
    Vulnerable
    (IUCN 1990)
  • 1988
    Vulnerable
    (IUCN Conservation Monitoring Centre 1988)
  • 1986
    Vulnerable
    (IUCN Conservation Monitoring Centre 1986)
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Threats

Endangered (EN) (A2ce, B1+2c)
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: of no interest; aquarium: commercial
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Wikipedia

Naked characin

The naked characin (Gymnocharacinus bergii) is a small species of fish in the Characidae family.[1] It is the southernmost member of the family (together with some Cheirodon species from Chile) and the only member of the genus Gymnocharacinus. It is endemic to a stream near Valcheta in northern Patagonia, Argentina. Adults have no scales. It is endangered because of habitat loss.

References[edit]

  1. ^ World Conservation Monitoring Centre 1996. Gymnocharacinus bergii. 2006 IUCN Red List of Threatened Species. Downloaded on 4 August 2007.


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