Overview

Comprehensive Description

Biology

Found on solid surfaces in flowing waters (Ref. 12693). Occurs in riffle and rapids during the dry season (Ref. 37769). Feeds on aquatic chlorophytes (Ref. 37769). Large adults are often seen in the markets of the upland Mekong (Ref. 12693).
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Distribution

Range Description

This species is endemic to the Mekong River. It is recorded from Cambodia (including the Mekong, Srepok and Sesan Rivers), Lao PDR (from below and above the Khone falls), Viet Nam (Srepok River) and eastern and northeastern Thailand.
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Asia: Mekong basin.
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Thailand.
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Physical Description

Morphology

Dorsal soft rays (total): 11; Vertebrae: 41 - 43
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Size

Maximum size: 255 mm SL
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Max. size

28.0 cm SL (male/unsexed; (Ref. 30857))
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Diagnostic Description

Large tubercles on sides of head in larger specimens; dark spot just behind spiracle; all fins strongly spotted; 10 branched dorsal-fin rays (Ref. 12693).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Found in flowing waters (Rainboth 1996) over rocky habitat; occurs in riffles and rapids during the dry season. Feeds on aquatic chlorophytes. Migrates seasonally up the Mekong mainstream (e.g., from the Tonle Sap River through the Khone Falls; Baird et al. 2003).

Systems
  • Freshwater
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Environment

demersal; potamodromous (Ref. 51243); freshwater
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Migration

Potamodromous. Migrating within streams, migratory in rivers, e.g. Saliminus, Moxostoma, Labeo. Migrations should be cyclical and predictable and cover more than 100 km.
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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
2011

Assessor/s
Allen, D.

Reviewer/s
Baird, I., Parenti, L., Vidthayanon, C., Rainboth, W., Conway, K.W. & Brooks, E.

Contributor/s

Justification
The species is recorded from the Mekong and associated tributaries in Thailand, Lao PDR, Viet Nam and Cambodia. It is a migratory species that is of very high value to local and national economies. The species is likely to be impacted in parts of its range by dams and overfishing. Due to its wide distribution the species is currently assessed as Least Concern, however the negative impacts of dams to be implemented on the river may increase the decline in population to such an extent as to place this species into a threatened category.
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Population

Population
The species contributed 1,979 tonnes to annual fishery catches in the Lower Mekong (ICEM 2010), 1.6% of total catches. Considered to be one of the most common species in catches in northeastern Cambodia and southern Lao PDR (Baird 2009).

Population Trend
Unknown
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Threats

Major Threats
Likely to be impacted in parts of its range by dams and overfishing. It is considered vulnerable to disruption of its spawning migration from development of the proposed mainstream Mekong dams (e.g., ICEM 2010), which predicts "relatively low" (2% to15% for each dam passed) downstream mortality rates, dependent upon the nature of mitigation measure, if any, the proportion of the population that passes successfully through dam turbines, and the number of dams constructed along the migratory route.
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Least Concern (LC)
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Management

Conservation Actions

Conservation Actions
Further research and monitoring is urgently needed into the species population trends and the impacts of proposed hydropower dams.
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Relevance to Humans and Ecosystems

Benefits

Importance

fisheries: commercial
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