Schistura quasimodo 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Cypriniformes Balitoridae

Scientific Name: Schistura quasimodo Kottelat, 2000

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(i,ii,iii)+2ab(i,ii,iii) ver 3.1
Year Published: 2012
Date Assessed: 2011-01-19
Assessor(s): Kottelat, M.
Reviewer(s): Gibson, C. & Allen, D.

The species is currently known from the Nam San stream in the Nam Ngum basin, Lao PDR, where it is only known from upstream of the Nam Ngum 1 dam (completed in 1971). The Nam San is one of a several streams that now enter into the Nam Ngum 1 reservoir. The distribution, if different, prior to the construction of the dam of the species in the river is not known, and it is not known if the species is present in other tributaries within the Nam Ngum drainage. A number of further dams are now in operation (e.g., the Nam Ngum 2), nearing completion, or are proposed within the Nam Ngum drainage, however impacts from these dams on the species are uncertain without better knowledge of the species' distribution. For example, the species is known from the Nam San, whilst the Nam Ngum 2 dam that is nearing completion is on the Nam Ngum.

The species has an Extent of Occurrence (based on the currently known presence in the Nam San) of 898 km2, an 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. The species is considered Endangered at present as it has a very restricted area and extent of occurrence that are inferred to be declining, and known at present from a single location, with recent mining activities in the watershed adding additional potential impacts. Further research is required to confirm the species' distribution. It is possible that the species would qualify for a higher threatened category, and the species should be reassessed when further information becomes available.

Geographic Range [top]

Range Description:

This species is known from the lower and upper Nam San catchment, a tributary of the Nam Ngum, northern Lao PDR (Kottelat 2000). The Extent of Occurrence is estimated at less than 898 km2 and the Area of Occupancy at 98 km2, both based on the extent of the Nam San above the Nam Ngum 1 reservoir.

Countries occurrence:
Lao People's Democratic Republic
Additional data:
Estimated area of occupancy (AOO) - km2:98Continuing decline in area of occupancy (AOO):Yes
Estimated extent of occurrence (EOO) - km2:898
Continuing decline in extent of occurrence (EOO):Yes
Range Map:Click here to open the map viewer and explore range.

Population [top]


This species is known from a single sampling effort in 1997 and has not been observed again as no further research has been carried out (Kottelat 2000). Populations are inferred to be declining as a result of mining activities reported within the watershed in 2012 (M. Kottelat pers. comm. 2012).

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, in riffles, over gravel to stone substrate.

Continuing decline in area, extent and/or quality of habitat:Yes
Movement patterns:Unknown

Use and Trade [top]

Use and Trade:

This species is utilised 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, there is also a large-scale Australian-owned company (Phu Bia Mining Ltd.) operating there, and it is possible that iron ore extraction may occur in the future.

The impact of dams within the Nam Ngum drainage on the species is uncertain as current and proposed dams are below the Nam Ngum 1 reservoir or are on other rivers.

Conservation Actions [top]

Conservation Actions:

Research is needed into the species' distribution and ecology, and the impacts of threats including dams.

Citation: Kottelat, M. 2012. Schistura quasimodo. The IUCN Red List of Threatened Species 2012: e.T180931A1679325. . Downloaded on 19 September 2017.
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