Cyprinus micristius 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Cypriniformes Cyprinidae

Scientific Name: Cyprinus micristius Regan, 1906
Common Name(s):
English Dianchi Carp
Cyprinus micristius Chen and Yang, 2002
Cyprnus micristius Chen and Huang (in Wu 1977)
Mesocyprinus micristius Fang, 1936
Taxonomic Notes: Cyprinus micristius Regan. Fang (1936) erect a new genus Mesocyprinus and assign it as the type. Chen and Huang (in Wu 1977) assign it as Cyprnus (Mesocyprinus) micristius. Chen and Yang (2002) reject the validity of Mesocyprinus and recover it as Cyprinus micristius.

Assessment Information [top]

Red List Category & Criteria: Critically Endangered (Possibly Extinct) B1ab(i,ii,iii,iv)+2ab(i,ii,iii,iv) ver 3.1
Year Published: 2008
Date Assessed: 2008-01-01
Assessor(s): Chen, X.-Y. & Yang, J.
Reviewer(s): Kullander, F. (Freshwater Fish Red List Authority) & Smith, K. (IUCN Freshwater Biodiversity Assessment Unit)
Cyprinus micristius is endemic to Lake Dianchi and its tributaries, Yunnan Province, China. It was a common commercial species in the 1960s, but it has not been caught in the main lake or been found in any fish market around the lake for the past 20 years. The main threats that caused this decline are introduced fish species, water pollution, and the loss of habitat. There may be a sub-population that has survived in Songhuaba reservoir (3.63 km²), but this needs further research.
Date last seen: 1980s
Previously published Red List assessments:

Geographic Range [top]

Range Description:Only ever known from Lake Dianchi and it tributaries. It may now only survive in Songhuaba Reservior.
Countries occurrence:
Possibly extinct:
China (Yunnan)
Additional data:
Estimated area of occupancy (AOO) - km2:3.63Continuing decline in area of occupancy (AOO):Yes
Estimated extent of occurrence (EOO) - km2:3.63
Continuing decline in extent of occurrence (EOO):Yes
Number of Locations:1
Lower elevation limit (metres):1874
Upper elevation limit (metres):2220Lower depth limit (metres):10
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:There is no record of this species in past few decades from Lake Dianchi.  It was a common commercial species in the 1960s, but it has not been caught in the main lake or been found in any fish market around the lake for about 20 years. It may survive in Songhuaba Reservior but the population size is unknown.
Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:It stays mostly in calm water with plenty of waterweeds. It feeds on miscellaneous food but primarily on aquatic insects, small shrimps etc. It spawns from May to July at the littoral zone on mud and sand. Its growth is slow (Wu et al. 1963, Yang and Chen 1994, Yue and Chen 1998).
Continuing decline in area, extent and/or quality of habitat:Yes
Congregatory:Congregatory (and dispersive)

Threats [top]

Major Threat(s): The reproduction and growth rate of Cyprinus micristius is low. The pollution of the lake water, overfishing and the introduction of alien fish species has caused a sharp decline in the species population.

Conservation Actions [top]

Conservation Actions: The “Regulations on the Management of Dianchi Lake” indicates that the lake is closed to fishing in the season when this species is breeding.

Citation: Chen, X.-Y. & Yang, J. 2008. Cyprinus micristius. The IUCN Red List of Threatened Species 2008: e.T6178A12541801. . Downloaded on 23 September 2018.
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