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Pseudobarbus phlegethon

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA ACTINOPTERYGII CYPRINIFORMES CYPRINIDAE

Scientific Name: Pseudobarbus phlegethon
Species Authority: (Barnard, 1938)
Common Name(s):
English Fiery Redfin
Synonym(s):
Barbus phlegethon Barnard, 1938
Taxonomic Notes: This lineage can be distinguished from the Doring lineage with allozyme loci and it does not share mitochondrial DNA alleles. In addition there are consistant colour pattern differences. However, no formal description of subspecies has been done to date.

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(ii,iii,v)+2ab(ii,iii,v) ver 3.1
Year Published: 2007
Date Assessed: 2007-03-01
Assessor(s): Swartz, E. & Impson, D.
Reviewer(s): Snoeks, J. (Freshwater Fish Red List Authority) & Darwall, W. (Freshwater Biodiversity Assessment Programme)
Justification:
Over the last 70 years the Jan Dissels population that forms part of the Olifants lineage has progressively declined to extinction. However, the major decline occurred during the initial establishment of alien invasive largemouth and smallmouth bass in the 1930s and 1940s. A small area of the lower Noordhoeks River has been lost due to water extraction. However, the recent decline does not qualify listing under criterion A. Extent of occurrence (EOO) is less than 5,000 km². Actual area of occupancy is about 0.072 km² calculated for the Oudste (1 km), Thee (4 km), Noordhoeks (6 km), Boskloof (3 km) and Rondegat (10 km). Three locations are known: the Rondegat; Boskloof (both with barriers to alien species); and Oudste, Thee and Noorhoeks (without barriers and therefore considered together as one location). The populations are severely fragmented due to the introduction of alien fishes, but each of the populations, with the possible exception of the Oudste population, is large enough to survive without the need for immigration. The species therefore qualifies for Endangered under criteria B1ab(ii,iii,v)+2a(ii,iii,v).
History:
1996 Endangered
1994 Endangered (Groombridge 1994)
1990 Endangered (IUCN 1990)
1988 Endangered (IUCN Conservation Monitoring Centre 1988)
1986 Endangered (IUCN Conservation Monitoring Centre 1986)

Geographic Range [top]

Range Description: Occurs in the Oudste, Thee, Noordhoeks, Boskloof and Rondegat tributaries of the Olifants River system on the western side of the Cederberg Mountains (Bills 1999, Swartz 2000, Swartz 2004).
Countries:
Native:
South Africa (Western Cape)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: No information is available on population trends.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: They prefer cobble habitat in the lower reaches of tributary streams, with moderate flow. Clear sexual dimorphism exists and males have bright red fins in the breeding season and defend territories (Skelton 1988).
Systems: Freshwater

Threats [top]

Major Threat(s): Alien invasive fish species have reduced their range significantly. There must have been a rapid and major reduction in their range soon after the introduction of especially Micropterus dolomieu in the 1940s. Unsustainable water extraction is also a major threat, especially where the lower reaches of tributary streams are affected. This lineage has gone extinct in the Jan Dissels River, a major tributary of the Olifants River and are no longer found in mainstream areas where they probably occurred before the introduction of alien fishes.

Conservation Actions [top]

Conservation Actions: A river rehabilitation project is planned for the Rondegat River that will significantly increase the size of that population.

Citation: Swartz, E. & Impson, D. 2007. Pseudobarbus phlegethon. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 18 September 2014.
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