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Schistura coruscans 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Cypriniformes Balitoridae

Scientific Name: Schistura coruscans Kottelat, 2000

Assessment Information [top]

Red List Category & Criteria: Data Deficient ver 3.1
Year Published: 2012
Date Assessed: 2011-01-19
Assessor(s): Kottelat, M.
Reviewer(s): Gibson, C. & Allen, D.
Justification:

This species is known from a tributary of of the Nam Ngum, Lao PDR, where it was discovered during a survey in 1997. No further research has been carried and the species is not yet to have been observed again. The species was collected in riffles, amongst stones and will be utilised within local subsistence fisheries. Although no data are available on the extent of impacts to the species, the surrounding habitat has been deforested and is used for agriculture, with associated impacts such as soil erosion, sedimentation and agricultural pollution expected to effect the aquatic environment. In addition, small- and large-scale gold mining operations are now active within the Nam Ngum watershed (M. Kottelat pers. comm. 2012).

The species has an Extent of Occurrence (based on the currently known presence in the Nam San) of 898 km2, and AOO of 98 km2, and a restricted number of locations. It may be that the species population is stable within the Nam San, however there are both ongoing and potential future mining operations within the Nam Ngum watershed, and the surrounding habitat has been deforested and agriculture occurs in the area, although the extent of impacts from soil erosion, sedimentation and agricultural pollution are uncertain. Based on how little is known about this species, it is assessed as Data Deficient. Further research is required to confirm the species distribution, and it should be reassessed if this becomes available.

Geographic Range [top]

Range Description:

The species is known from the lower and upper Nam San catchment, a tributary of the Nam Ngum, Lao PDR (Kottelat 2000).

Countries occurrence:
Native:
Lao People's Democratic Republic
Additional data:
Estimated area of occupancy (AOO) - km2:98
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:

Known from a survey carried out in 1997 and has not been observed again as no further research has been carried out (M. Kottelat pers. comm. 2011). Due to mining operations observed in 2012 within the Nam Ngum watershed (M. Kottelat pers. comm. 2012), the population of the species is inferred to be declining.

Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:

Observed in streams with moderate to fast water, over gravel to stone substrate.

Systems:Freshwater
Movement patterns:Unknown

Use and Trade [top]

Use and Trade:

This species will be utilized as part of local subsistence fisheries (M. Kottelat pers. comm. 2011).

Threats [top]

Major Threat(s):

The surrounding habitat has been deforested and agriculture occurs in the area. Associated impacts such as soil erosion, sedimentation and agricultural pollution are expected to impact the aquatic environment (M. Kottelat pers. comm. 2011). Additional survey in the area in 2012 found extensive small-scale gold mining excavations in the area that impact several kilometres of stream downstream, and a there is a large-scale Australian-owned company (Phu Bia Mining Ltd.), and it is possible that iron ore extraction may occur.

Currently operating and known planned dams are all downstream of the species currently known location, however these will impact the species if it has a wider distribution than currently known.

Conservation Actions [top]

Conservation Actions:

No conservation actions known. Research is needed into the species distribution, population trends, and threats.


Citation: Kottelat, M. 2012. Schistura coruscans. The IUCN Red List of Threatened Species 2012: e.T180837A1668270. . Downloaded on 15 December 2017.
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