Overview

Comprehensive Description

L. ansorgii Boulenger, 1907

BMNH 1907.6.29.210, 1 specimen, Dongoena Swamps, Cuene River, Angola ;

  • Timo Moritz (2007): Description of a new cyprinid species, Labeo meroensis n. sp. (Teleostei: Cyprinidae), from the River Nile. Zootaxa 1612, 55-62: 55-55, URL:http://www.zoobank.org/urn:lsid:zoobank.org:pub:D6B4BF95-912E-47AD-9307-25A41BAD8D36
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Biology

Prefers flowing water in rocky habitats (Ref. 7248).
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Distribution

Range Description

Endemic to Angola where it occurs in the Kwanza river system (Kwanza River and Lucala River).
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Range Description

Native from Angola and Namibia. In Angola the species occurs in Bengo River and Lake Kilunda, Kwanza River (Dongwenna swamp, Lucala River, Kwanza River), and Kunene River systems.
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Africa: within the drainage basins of the Cuanza and Cunene river systems of Angola and Namibia (Ref. 2801, 7248). Unconfirmed record from the Congo basin.
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Southern Africa: Angola and Namibia.
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Physical Description

Size

Maximum size: 240 mm SL
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Max. size

25.0 cm SL (male/unsexed; (Ref. 2801))
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Ecology

Habitat

Kunene River Benthopelagic Habitat

This taxon is one of a number of benthopelagic species in the Kunene River system. Benthopelagic river fish are found near the bottom of the water column, feeding on benthos and zooplankton

The Kunene River rises in the central highlands of Angola, and thence flows southward to form a major element of the border between Namibia and Angola before the final discharge is to the Atlantic Ocean in the vicinity of the Angola-Benguela Front. The geometry of the Kunene riparian zone is distinctly narrow, with rugged arid landscapes persisting on both sides of the river over long distances, and a virtual lack of any extensive floodplains.

There is a relatively high rate of endemism of aquatic biota in the Kunene. Proposed expansion of dams on the Kunene poses a threat to biodiversity in the river, especially regarding proposals at Epupa Falls. However, a greater threat to the Kunene is a plan by Angola to greatly expand withdrawal of water from the river to expand irrigated agriculture by 600,000 hectares; not only will this action significantly diminish downriver flow rates, but also add considerable nitrate, herbicide and pesticide substances to the river.

The catchment area of the Kunene Basin is approximately 106,560 square kilometres (41,143 square miles) in area, of which 14 100 km² (13%) lies within Namibian territory. Its mean annual discharge is 174 cubic meters per second (6145 cubic feet per second) at its mouth on the Atlantic. Water quality of the Kunene River is relatively high, since the human population density and agricultural intensity is relatively low, including a conspicuous absence of overgrazing. However, bacteria and other microbial pathogens pose a material threat to Kunene water quality, due to the fact that only a small fraction of the domestic wastewater in Angola is treated;

Regarding freshwater bivalves, the central reaches of the Kunene manifest particularly high endemism, similar to parts of the Okavango, Chobe, Upper Zambezi and Etosha Pan basins. The bivalve Etheria elliptica, which also occurs in the Upper Zambezi, is a freshwater mussel in the family Etheriidae, known from a limited extent of the central Kunene River in Angola. It is threatened by proposed dam construction on the Kunene.

There are several endemic benthopelagic fishes in the Kunene River: the eight centimeter (cm) long Kunene dwarf happy (Orthochromis machadoi); the 14 cm benthopelagic Namib happy (Thoracochromis buysi); and the seven cm benthopelagic Kunene kneria (Kneria maydelli).

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Habitat and Ecology

Habitat and Ecology
Biology and preferred habitat are not known.

Systems
  • Freshwater
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Habitat and Ecology

Habitat and Ecology
This species occurs in flowing water in rocky streams. Biology is not known.

Systems
  • Freshwater
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Environment

benthopelagic; freshwater
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Trophic Strategy

Prefers flowing water in rocky habitats (Ref. 7248).
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Labeo ansorgii

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 4
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2007

Assessor/s
Da Costa, L.

Reviewer/s
Snoeks, J. (Freshwater Fish Red List Authority) & Darwall, W. (Freshwater Biodiversity Assessment Unit)

Contributor/s

Justification
Only known from two localities in the Lower Kwanza River (Lucala and Kwanza rivers). No many data available. No obvious known threats. Larger range distribution expected. More comprehensive surveys required to confirm the true extent of its distribution.
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IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2007

Assessor/s
Da Costa, L.

Reviewer/s
Snoeks, J. (Freshwater Fish Red List Authority) & Darwall, W. (Freshwater Biodiversity Assessment Unit)

Contributor/s

Justification
Known from three different catchments (Bengo, Kwanza and Kunene rivers). Major threat only known for the Kunene populations. Larger range distribution expected in the Kwanza River system.
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Population

Population
Population size is not known.

Population Trend
Unknown
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Population

Population
Population size is not known.

Population Trend
Unknown
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Threats

Major Threats
Threats are not known.
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Major Threats
No known threats in the Kwanza and Bengo River systems. However, a dam exists in the Kunene River separating the upper reaches populations from the Lower Kunene population(s).
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Least Concern (LC)
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Management

Conservation Actions

Conservation Actions
The species has no protection.
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Conservation Actions

Conservation Actions
The species has no protection.
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Wikipedia

Cunene Labeo

The Cunene labeo or Kunene labeo[2] (Labeo ansorgii) is a species of fish in the family Cyprinidae, the carps and minnows. It is native to Angola and Namibia.[1]

This fish occupies rocky habitat in flowing river waters.[3] It is recorded from the Bengo, Cuanza, and Cunene Rivers.[1]

Little is known about the biology or population sizes of this fish. It faces no apparent threats except a dam on the Cunene River, which separates populations on the upper river from those on the lower parts.[1]

References[edit]

  1. ^ a b c d Da Costa, L. 2007. Labeo ansorgii. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.1. Downloaded on 16 October 2013.
  2. ^ Okeyo, D. O. On the biodiversity and the distribution of freshwater fish of Namibia: An annotated update. In: Palomares, M. L. D., et al. Fish Biodiversity: Local Studies as Basis for Global Inferences. ACP-EU Fisheries Research Initiative. 2003. pp 156-94.
  3. ^ Froese, R. and D. Pauly. (Eds.) Labeo ansorgii. FishBase. 2011.
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