Development of Fishway Design Criteria for Floodplain Species of the Lower Mekong Basin
Irrigation development in Lao P.D.R. has led to construction of numerous water regulation devices (over 10,000) which limit migratory fish movement. Movements of fish (and other aquatic animals) between rivers and floodplains is subsequently restricted, or may be entirely prevented, and this has led to severe declines in fish production in many areas. Previous research in Lao P.D.R. has demonstrated that fish-passage technology has the potential to enable movement of migratory fish past these low-level (less than 6 m) barriers. Consequently, fisheries agencies are interested in increasing capacity to design manage and operate fish passage facilities on new and existing low-level water control structures in order to ensure the long-term sustainability of fish resources. Preliminary work identified that vertical slot fishways, on conservative slopes, can provide effective passage for many species and individuals of fish in the Lower Mekong Basin. Over 20,000 fish from over 100 species were found to ascend an experimental fishway facility over a 40 day period. A 1:15 slope hydraulic slope was most successful but there was no single design that provided passage for all species. This suggests that the Lower Mekong Basin has a highly diverse fish community with many different movement strategies.
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Development of Fishway Design Criteria for Floodplain Species of the Lower Mekong Basin
- 1. Development of Fishway Design Criteria for floodplain Species of the Lower Mekong Basin Khampheng Homsombath, Lee Baumgartner, Jarrod McPherson, Tim Marsden, Garry Thorncraft, Oudom Phonekhampeng; Douangkham Singhanouvong; Ubolratana Suntornratana AFS Portland, 2015
- 3. Many different landscapes: China Yunnan
- 4. Many different landscapes: Northern Laos Luangprabang, Laos
- 5. Many different landscapes: Central/Southern
- 6. Many different landscapes: Cambodia border
- 7. Many different landscapes: Delta
- 8. Dry Season
- 9. Wet Season
- 10. Home of charismatic Megafauna!
- 11. And many small fish (over 900 species)
- 12. LMB – approx 2.2 million tonnes per annum About 2% of total world fish catch, 900 spp Fish Beef Pork Chicken kg/person/year kg/person/year kg/person/year kg/person/year Lao PDR 29 (48% animal protein) 5 6 5 Cambodia 37 (79% animal protein) 2 3 2 Social Importance of fish Importance of fish in sustenance diets
- 17. Floodplain development is increasing at an alarming rate
- 24. Research different design aspects Slope, turbulence, slot width etc
- 28. Future need: 1. Improved understanding of local physiology and ecology
- 29. Future need: 2. Ensuring developers and managers have the information!
- 30. Future need: 3. Putting it all into practice in a coordinated way
- 31. Want to know more about the MDFRC? Subscribe to LIMNOSPHERE, the MDFRC enewsletter by visiting www.mdfrc.org.au Follow @MuDFReaCk on Twitter Acknowledgements: