Yunnanilus nigromaculatus 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Cypriniformes Balitoridae

Scientific Name: Yunnanilus nigromaculatus
Species Authority: (Regan, 1904)
Nemachilus nigromaculatus Regan, 1904

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii,v) ver 3.1
Year Published: 2011
Date Assessed: 2011-01-18
Assessor(s): Chen, X.-Y.
Reviewer(s): Allen, D.J., Zhao, H., Cui, K. & Zhou, W.
The species is endemic to Dianchi Lake (298 km2) and Yangling Lake (c.1 km2)YunnanChina, and some streams that feed the lakes. The species is thought to be absent from Dianchi Lake due to heavy pollution, and is likely only present in some of the feeder streams. The extent of occurrence is c.300 km2. The species is known to be present only in Yangling Lake, and in two of the feeder streams of Dianchi Lake, but further survey may find it to be present in further streams. The species is assessed as Endangered due the the restricted EOO, and threats that include pollution.
Previously published Red List assessments:
1996 Endangered (EN)
1994 Endangered (E)

Geographic Range [top]

Range Description: Endemic to Dianchi Lake (298 km2) and Yangling Lake (c. 1 km2), Yunnan, China, and some streams that feed the lake. The species is thought to be absent from Dianchi Lake due to heavy pollution, and is likely only present some of the feeder streams (some of which are also polluted). The upper reaches of the streams have not been surveyed.
Countries occurrence:
China (Yunnan)
Number of Locations: 2
Lower elevation limit (metres): 1800
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Little information available; was collected in 2007, but had declined in the past (X-Y. Chen pers. comm. 2011).
Current Population Trend: Decreasing
Additional data:
Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: Lacustrine but also found in streams that feed the lake; the lake itself is heavily polluted.
Systems: Freshwater

Use and Trade [top]

Use and Trade: A very small fish, not likely caught commercially.

Threats [top]

Major Threat(s): The species has been extirpated from Dianchi Lake by heavy pollution from Kunming City, industrial development, and agricultural development and its presence in in Yangling Lake is not known. Some of the streams that feed Dianchi Lake are less impacted.

Conservation Actions [top]

Conservation Actions: The streams are within a national protection site. The surrounding drainage is under the high priority protection of Kunming City for drinking water.

Citation: Chen, X.-Y. 2011. Yunnanilus nigromaculatus. The IUCN Red List of Threatened Species 2011: e.T23175A9425121. . Downloaded on 29 November 2015.
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