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Bagarius rutilus

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA ACTINOPTERYGII SILURIFORMES SISORIDAE

Scientific Name: Bagarius rutilus
Species Authority: Ng & Kottelat 2000
Taxonomic Notes:


Assessment Information [top]

Red List Category & Criteria: Data Deficient ver 3.1
Year Published: 2012
Date Assessed: 2011-07-21
Assessor(s): Allen, D.
Reviewer(s): Smith, K. & Ng, H.H.
Justification:
Given the relatively restricted distribution of this species (when compared to congeners) and the apparent threats faced by this species, it appears logical to assess this species as Near Threatened.  However, given that empirical data to support population declines is badly needed to ascertain the current status of the global population, it is assessed here as Data Deficient.

Geographic Range [top]

Range Description: The species is known from China (Red River basin in Yunnan) and northern Vietnam (the Red, Thái Bình, Sông Kỳ Cùng, Mã and Lam rivers; Ng and Kottelat 2000).  It may be present in northern Laos, in the rivers that drain into the Red River drainage (Nam Xam and Nam Ma basins).
Countries:
Native:
China (Yunnan); Viet Nam
Present - origin uncertain:
Lao People's Democratic Republic
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The species populations is believed to have declined over 20% in many parts of its range as a result of dam construction across rivers for irrigation and hydroelectricity, but empirical data is needed to support this.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: A large fish, often concentrated in the middle and upper parts of river. The small fish over 15 cm, eat aquatic larvae and insects such as Ephemeroptera, Trichoptera, Hemiptera, Cleoptera, Odonata, shrimp, and juvenile fish. Mature fish eat other fish. Therefore, they generally congregate in areas where numerous other fishes are present, especially the breeding grounds of other fish. Fish starts to develop when it is 3-4 years old, when weigh is range 3-6 kg. Breeding season is from March to June or later, fish migrate from lower to middle parts to upper rivers and streams. Eggs rather large, irregular diameter from 1.1 to 1.4 mm. Fish lay eggs in stone niches, eggs stick to the bottom in nests. Parents protect fish eggs and juveniles.
Systems: Freshwater

Use and Trade [top]

Use and Trade: Found in fisheries, has high economic value. Exploitation throughout the year, mostly in December to May in the next year. Production of exploitation in the middle river is high, especially in the Red River. The fish has been cultivated in Viet Nam.

Threats [top]

Major Threat(s): Populations have declined as a result of overfishing and the loss and degradation of habitats, including dam construction. Nguyen (2008) found that the species is likely to be impacted by the construction of the Trung Son dam on the Ma River in northern Viet Nam.

Conservation Actions [top]

Conservation Actions: The species has been assessed as Vulnerable at the national level in Viet Nam. Further research into the impact of known threats, including dam contruction and fishery pressure, needs research.

Citation: Allen, D. 2012. Bagarius rutilus. The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 20 December 2014.
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