Overview

Comprehensive Description

Biology

Lives in the edge of the lake with plenty of waterweeds. Carnivore. Stays at bottom of water by day and comes out to the surface seeking food by dawn and dusk (Ref. 45563).
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Distribution

Range Description

Endemic to Lake Dianchi, Yunnan Province, China. The species is not yet known from elsewhere but it maybe exists in some reservoirs, such as Songhuaba.
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Asia: endemic to Dian Chi Lake, Yunnan, China.
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Lakes of Dianchi and Yilong, Yunnan Province, China.
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Physical Description

Morphology

Dorsal soft rays (total): 4 - 6; Analsoft rays: 61 - 73
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Diagnostic Description

Head depressed; eyes small and located in anterior section of head; snout short; lower jaw longer than upper one and its end extending nearly to anterior edge of eyes; barbels 2 pairs, body naked. Body dark gray on back and sides, with cloudy streaks and milky white on belly.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Lives in the littoral zone of the lake with plenty of waterweeds and is carnivorous. It stays at bottom of water by day and comes out to the surface of water seeking food by dawn and dusk.

Systems
  • Freshwater
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Environment

demersal; freshwater
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Trophic Strategy

Lives in the edge of the lake with plenty of waterweeds. Carnivore. Stays at bottom of water by day and comes out to the surface seeking food by dawn and dusk.
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
CR
Critically Endangered

Red List Criteria
B1ab(ii,iii); D

Version
3.1

Year Assessed
2008

Assessor/s
Chen, X.-Y. & Yang, B.

Reviewer/s
Kullander, F. (Freshwater Fish Red List Authority) & Smith, K. (IUCN Freshwater Biodiversity Assessment Unit)

Contributor/s

Justification
Silurus mento is endemic to Lake Dianchi (surface area 292.6 km²), Yunnan Province, China. The species occurs only in the littoral zone of the lake so its extent of occurrence is estimated at about 20% of the lake area: 63.5 km². It was common before 1950s, started to become rare in late 1950s, and has not been found in the lake since the 1970s. This is most likely due to habitat loss and introduced species. It is most likely extinct from the lake, but further surveys are needed to confirm this and the possibility that a population may be present in connected reservoirs such as Songhuaba.

History
  • 1996
    Endangered
    (Baillie and Groombridge 1996)
  • 1996
    Endangered
  • 1994
    Insufficiently Known
    (Groombridge 1994)
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Population

Population
Only ever known from Lake Dianchi itself, there hass no record of this species since 1970s. The population size is probably very small.

Population Trend
Unknown
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Threats

Major Threats
Its loss from the lake is likely due to habitat loss and introduced fish species. This fish is relying on littoral zone with macrophytes, its disappearance from the lake is obviously related to loss of macrophytes, which result in these big fishes exposed in the shallow water and increased mortality from its natural enemy and human beings, and being short of food etc. Predation of eggs and juveniles by introduced species may also play an important role.
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Critically Endangered (CR) (B1ab(ii,iii); D)
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Management

Conservation Actions

Conservation Actions
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Wikipedia

Kunming catfish

The Kunming catfish, Silurus mento, is a species of fish in the Siluridae family. It is endemic to China where it occurs in Dian Chi Lake. This species grows to a length of 21.5 centimetres (8.5 in) TL.

References[edit]

  1. ^ Chen, X.-Y. & Yang, B. (2008). "Silurus mento". IUCN Red List of Threatened Species. Version 2011.1. International Union for Conservation of Nature. Retrieved 9 August 2011. 


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