Pangasius Conchophilus

The IUCN Red List of Threatened Species™ ISSN 2307-8235 (online) IUCN 2008: T181218A1710343

Pangasius conchophilus

Assessment by: Vidthayanon, C.

View on www.iucnredlist.org

Citation: Vidthayanon, C. 2012. Pangasius conchophilus. The IUCN Red List of Threatened Species 2012: e.T181218A1710343. http://dx.doi.org/10.2305/IUCN.UK.2012-1.RLTS.T181218A1710343.en

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THE IUCN RED LIST OF THREATENED SPECIES™ Taxonomy

Kingdom Phylum Class Order Family

Animalia Chordata Actinopterygii Siluriformes Pangasiidae

Taxon Name: Pangasius conchophilus Roberts & Vidthayanon, 1991

Taxonomic Notes:

Assessment Information

Red List Category & Criteria: Least Concern ver 3.1

Year Published: 2012

Date Assessed: January 19, 2011

Justification: A common species, it is recorded from the Chao Phraya and Bangpakong rivers in Thailand, and the Mekong basin. It is highly utilised and impacted by habitat loss, but is assessed as Least Concern at present as there is no evidence at present of significant population declines across its range. Impacts from potential future mainstream dams should be monitored. Geographic Range

Range Description: The species is recorded from the Bangpakong and Chao Phraya rivers (Roberts and Vidthayanon 1991) in Thailand, and from the lower Mekong basin (from Yunnan in southern China to Viet Nam). Chhea (2002) records the species presence in Myanmar, which requires confirmation, and the species has been introduced to Malaysia.

Country Occurrence: Native: Cambodia; China (Yunnan); Lao People's Democratic Republic; Thailand; Viet Nam

Introduced: Malaysia

© The IUCN Red List of Threatened Species: Pangasius conchophilus – published in 2012. 2 http://dx.doi.org/10.2305/IUCN.UK.2012-1.RLTS.T181218A1710343.en Population This species is common; this species is the most common fish caught in the wet season wing trap fishery in the Khone falls in southern Lao PDR, comprising 41% of the catch by weight (Baird et al. 2004). Current Population Trend: Decreasing

Habitat and Ecology (see Appendix for additional information) Found in mainstreams and larger tributaries, migrating up river in the Mekong between May and July, though it may not be a long distance migrator. Migrates in large schools (Baird et al. 2004). This species feeds on fish, crustaceans, insects and, in the rainy season, is an important consumer of flooded forest fruits and leaves in the Mekong (Baird 2007).

In the dry season, inhabits deep water pools in large rivers.

Spawns in mainstream during flood season, larvae swept into floodplains. (Poulsen et al. 2004).

Systems: Freshwater

Use and Trade (see Appendix for additional information) This species is widely consumed throughout its range from both subsistence and commercial fisheries, and is locally cultured in cages from wild collected fries in Viet Nam. One of the most important species in the markets of the Chao Phraya and Mekong in Thailand.

Threats (see Appendix for additional information) Overfishing and dams in mainstream rivers are the threats to this species. The species is also impacted by the loss of flooded forest habitat in the Tonle Sap Lake and along the Mekong. Conservation Actions Monitoring of habitat and population trends is required, especially in relation to impacts of large mainstream dams. The species benefits from community conservation of deep pool habitats in the Mekong (Baird and Flaherty 2005, Baird 2006). Credits

Assessor(s): Vidthayanon, C.

Reviewer(s): Allen, D.J. & Baird, I.

Contributor(s): Fisher, J.

© The IUCN Red List of Threatened Species: Pangasius conchophilus – published in 2012. 3 http://dx.doi.org/10.2305/IUCN.UK.2012-1.RLTS.T181218A1710343.en Bibliography Baird, I.G. 2006. Strength in diversity: fish sanctuaries and deep-water pools in Lao PDR. Fisheries Management & Ecology 13(1): 1-8.

Baird, I.G. 2007. Fishes and forests: The importance of seasonally flooded riverine flooded riverine habitat for Mekong River fish species. Natural History Bulletin of the Siam Society 55(1): 121-148.

Baird, I.G. and Flaherty, M.S. 2005. Mekong River fish conservation zones in southern Laos: Assessing effectiveness using local ecological knowledge. Environmental Management 36(3): 439-454.

Baird, I.G., Flaherty, M.S. and Phylavanh, B. 2004. Mekong River Pangasiidae catfish migrations and the Khone Falls wing trap fishery in southern Laos. Natural History Bulletin of the Siam Society 52(1): 81- 109.

Baird, I.G., Flaherty, M.S., and Phylavanh, B. 2004. Mekong River Pangasiidae catfish migrations and the Khone Falls wing trap fishery in southern Laos. Natural History Bulletin of the Siam Society 52(1): 81- 109.

Chhea, C.K. 2002. Fisher's knowledge about migration patterns of three important Pangasius catfish species in the Mekong mainstream. Department of Fishery, Phnom Penh, Cambodia.

IUCN. 2012. IUCN Red List of Threatened Species (ver. 2012.1). Available at: http://www.iucnredlist.org. (Accessed: 19 June 2012).

Poulsen, A.F., Hortle, K.G., Valbo-Jorgensen, J., Chan, S., Chhuon, C.K., Viravong, S., Bouakhamvongsa, K., Suntornratana, U., Yoorong, N., Nguyen, T.T., and Tran, B.Q. 2004. Distribution and ecology of some important riverine fish species of the Mekong River Basin. MRC Technical Paper. Mekong River Commission, Phnom Penh.

Roberts, T.R. and Vidthayanon, C. 1991. Systematic revision of the Asian catfish family Pangasiidae, with biological observations and descriptions of three new species. Proceedings of the Academy of Natural Sciences of Philadelphia 143: 97-144.

Citation Vidthayanon, C. 2012. Pangasius conchophilus. The IUCN Red List of Threatened Species 2012: e.T181218A1710343. http://dx.doi.org/10.2305/IUCN.UK.2012-1.RLTS.T181218A1710343.en

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Habitats (http://www.iucnredlist.org/technical-documents/classification-schemes)

Major Season Suitability Habitat Importance? 5. Wetlands (inland) -> 5.1. Wetlands (inland) - Permanent - Suitable Yes Rivers/Streams/Creeks (includes waterfalls)

5. Wetlands (inland) -> 5.5. Wetlands (inland) - Permanent Freshwater - Marginal - Lakes (over 8ha)

Use and Trade (http://www.iucnredlist.org/technical-documents/classification-schemes)

End Use Local National International Food - human Yes Yes Yes

Threats (http://www.iucnredlist.org/technical-documents/classification-schemes)

Threat Timing Scope Severity Impact Score 5. Biological resource use -> 5.3. Logging & wood Ongoing Majority (50- Slow, significant Medium harvesting -> 5.3.3. Unintentional effects: 90%) declines impact: 6 (subsistence/small scale) Stresses: 1. Ecosystem stresses -> 1.2. Ecosystem degradation 5. Biological resource use -> 5.3. Logging & wood Ongoing Majority (50- Slow, significant Medium harvesting -> 5.3.4. Unintentional effects: (large 90%) declines impact: 6 scale) Stresses: 1. Ecosystem stresses -> 1.2. Ecosystem degradation 2. Species Stresses -> 2.2. Species disturbance 5. Biological resource use -> 5.4. Fishing & harvesting Ongoing Majority (50- Slow, significant Medium aquatic resources -> 5.4.1. Intentional use: 90%) declines impact: 6 (subsistence/small scale) Stresses: 2. Species Stresses -> 2.1. Species mortality 5. Biological resource use -> 5.4. Fishing & harvesting Ongoing Majority (50- Slow, significant Medium aquatic resources -> 5.4.2. Intentional use: (large 90%) declines impact: 6 scale) Stresses: 2. Species Stresses -> 2.1. Species mortality 7. Natural system modifications -> 7.2. Dams & water Future Majority (50- Rapid declines Low impact: 5 management/use -> 7.2.10. Large dams 90%) Stresses: 1. Ecosystem stresses -> 1.2. Ecosystem degradation 2. Species Stresses -> 2.2. Species disturbance 2. Species Stresses -> 2.3. Indirect species effects -> 2.3.8. Other

© The IUCN Red List of Threatened Species: Pangasius conchophilus – published in 2012. 5 http://dx.doi.org/10.2305/IUCN.UK.2012-1.RLTS.T181218A1710343.en Research Needed (http://www.iucnredlist.org/technical-documents/classification-schemes)

Research Needed 1. Research -> 1.5. Threats

3. Monitoring -> 3.1. Population trends

3. Monitoring -> 3.4. Habitat trends

Additional Data Fields

Distribution Lower elevation limit (m): 3

Upper elevation limit (m): 190

Population Population severely fragmented: No

Habitats and Ecology Movement patterns: Full Migrant

© The IUCN Red List of Threatened Species: Pangasius conchophilus – published in 2012. 6 http://dx.doi.org/10.2305/IUCN.UK.2012-1.RLTS.T181218A1710343.en The IUCN Red List of Threatened Species™ ISSN 2307-8235 (online) IUCN 2008: T181218A1710343

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