Overview

Comprehensive Description

Biology

Inhabits rivers and lakes.
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Distribution

Range Description

A. yunnanensis is found in the upper reaches of the Chang Jiang (Yangtze) River and the Xiajiang (West) River, and in the lakes in the eastern part of Yunnan province.
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China.
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Asia: China.
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Physical Description

Size

Maximum size: 200 mm OT
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Max. size

21.6 cm SL (male/unsexed; (Ref. 57459))
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Ecology

Habitat

Yangtze River Benthopelagic Habitat

This taxon is one of a number of benthopelagic species in the Yangtze River system. Benthopelagic fish inhabit the water column niche immediately above the bottom, feeding on benthos and zooplankton.

The upper Yangtze basin consists chiefly of Paleozoic limestone and terrigenous sedimentary rock, with some granitic material. The most downstream element of the upper Yangtze basin is often termed the Sichuan Basin; here the Yangtze cuts through Triassic and Permian material before entering the Three Gorges. The Three Gorges area is a stretch of the Yangtze that runs approximately 660 kilometers, terminating at the site of the Three Gorges Dam. Prior to construction of the dam, the Three Gorges area was a site of exceptional natural beauty; after dam construction the gorge areas were filled with approximately 100 meters in depth of Yangtze water, and considerable amounts of the watershed were graded.

The lower Yangtze basin consists of anabranching river structures and Pleistocene coastal terraces. Prior to development of the Three Gorges Dam, the Yangtze Delta was replenished with a copious sediment load reaching the river mouth; however, the dam has now severely limited the natural flow and deposition of sediment to the delta region. Consequently, the integrity of the delta is been compromised, with scouring exceeding deposition, and the very stability of the delta is endangered.

Lower and middle basins of the Yangtze carry heavy pollutant loads. In the lower Yangtze basin nitrate levels are high, measuring at about 1000 tons per day at Datong; these levels accrue from high applications of chemical fertilizer applied and also considerable loadings of untreated sewage due to the large human population of the basin, with correspondingly little infrastructure for sewage treatment.

Heavy metal concentrations are also high in the lower Yangtze, with measurements of dissolved lead at 0.078 microgram/liter; cadmium (0.024 microgram/liter), chromium (0.57 microgram/liter), copper (1.9 microgram/liter), and nickel (0.50 microgram/liter). Levels of dissolved arsenic have been measured at 3.3 microgram/liter) and zinc at 1.5 microgram/liter), both notably higher by factors of 5.5 and 2.5 respectively than other typical large world rivers. In Yangtze River suspended sediment, arsenic comprises 31 microgram/gram, lead comprises 83 microgram/gram, and nickel comprises 52 micrograms/gram of sediment content

A number of other benthopelagic associates are found in the Yangtze, including: Anabarilius polylepis, Bangana rendahli, Pseudogyrinocheilus prochilus, Sinocyclocheilus grahami and Siniperca roulei. The demersal fish Silurus meridionalis also is found as a Yangtze River endemic species.

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Habitat and Ecology

Habitat and Ecology
A. yunnanensis is a benthopelagic species which inhabits rivers and lakes.

Systems
  • Freshwater
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Environment

benthopelagic; freshwater
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Acrossocheilus yunnanensis

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 2
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2009

Assessor/s
Devi, R. & Boguskaya, N.

Reviewer/s
Collen, B., Darwall, W., Ram, M. & Smith, K. (SRLI Freshwater Fish Evaluation Workshop)

Contributor/s

Justification
A. yunnanensis has been assessed as Least Concern because, although locally threatened, the species has a relatively wide range, and population declines are not thought to be large enough to reach the threshold for a Threatened or Near Threatened assessment.
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Population

Population
Detailed population information is lacking for this species however it is decreasing.

Population Trend
Decreasing
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Threats

Major Threats
A. yunnanensis is locally threatened, for example in lake Dianchi, which is heavily polluted from both domestic and industrial sources. Bycatch is also a potential threat to the species.
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Least Concern (LC)
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Management

Conservation Actions

Conservation Actions
It is not known if there are any conservation measures in place or needed.
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: commercial
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Wikipedia

Acrossocheilus yunnanensis

Acrossocheilus yunnanensis is a species of ray-finned fish in the genus Acrossocheilus.

References

  1. ^ Froese, Rainer, and Daniel Pauly, eds. (2006). "Acrossocheilus yunnanensis" in FishBase. April 2006 version.


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