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LIMNOLOGICAL CHARACTERISTICS AND CAGE CULTURE PRACTICE IN INDRASAROBAR RESERVOIR OF NEPAL

LIMNOLOGICAL CHARACTERISTICS AND CAGE CULTURE PRACTICE IN INDRASAROBAR RESERVOIR OF NEPAL. Madhav K. Shrestha (IAAS, Chitwan, Nepal) Narayan P. Pandit (FDC, Hetauda, Nepal). World Aquaculture Conference 2008, 19-23 May, Busan, South Korea. ACKNOWLEDGEMENTS.

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LIMNOLOGICAL CHARACTERISTICS AND CAGE CULTURE PRACTICE IN INDRASAROBAR RESERVOIR OF NEPAL

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  1. LIMNOLOGICAL CHARACTERISTICS AND CAGE CULTURE PRACTICE IN INDRASAROBAR RESERVOIR OF NEPAL Madhav K. Shrestha (IAAS, Chitwan, Nepal) Narayan P. Pandit (FDC, Hetauda, Nepal) World Aquaculture Conference 2008, 19-23 May, Busan, South Korea

  2. ACKNOWLEDGEMENTS This research was funded by National Agricultural Research and Development Fund (NARDF), Nepal. All the funding for attending WAS ’08 was made by AquaFish CRSP. AquaFish CRSP USAID The Aquaculture CRSP is funded in part by United States Agency for International Development (USAID) Grant No. EPP-A-00-06-00012-00. The opinions expressed herein are those of the authors and do not necessarily reflect the views of the US Agency for International Development.

  3. Indrasarobar reservoir was built by damming in small river valley of mountain region of central Nepal. Established in 1982 for hydropower generation. Lies at the altitude of 1430 m from mean sea level (msl) at bottom. Introduction

  4. When filled it reaches 1530 m msl. Reservoir is 7 km in length and 50-500 m in width. Total area is 216 ha when filled and 55 ha when dry. Introduction….

  5. Introduction…. • Water depth lowest 60 m and highest 100 m . • Reservoir is fed with seven small streams. • Filled during rainy season and draw down continuously till next rainy season occurs.

  6. Started in 1988 Technology copied from Phewa lake (Extensive system) Fish Species: Silver carp Bighead carp Cage culture

  7. Cage culture …… • Cage size: • 5 m x 5 m x 2 m • 50 m3 ( in general) • Stocking density: • 10 fish/m3 • Feeding: • None

  8. Cage Materials • Bamboo poles for frame as well as for float • Recently plastic drum as floats • Nylon net Cage: • Nursery cage – 10 mm mesh • Grow out cage - 20 – 50 mm mesh

  9. Cage culture expansion and production trend

  10. Increased cage landing

  11. Cage culture expansion trend

  12. Cage productivity and Open water catch of reservoir

  13. Total cage fish production trend

  14. Productivity trend of cage fish culture in reservoir

  15. Trend of fish catch from reservoir

  16. Limnological Characteristics of Reservoir Monthly mean and range of water quality parameters of reservoir during May 2006 to April 2007

  17. Monthly mean water depth of the reservoir

  18. Monthly water temperature during 2006-2007

  19. Limnological Characteristics…….

  20. Monthly mean chlorophyll-a during 2006-2007

  21. Limnological Characteristics…….

  22. Monthly mean total nitrogen (TN) and total phosphorus (TP) trend in reservoir during 2006-2007

  23. Monthly mean total ammonium nitrogen (TAN) and soluble reactive phosphorus (SRP) content trend in reservoir during 2006-2007.

  24. Conclusion • Increased cage landing has decreased productivity – Plankton limitation • Mean fish harvest size has been decreased • Current cage culture is about 4 ha which is about 2% area of the reservoir when fully filled and about 7% of the reservoir when lowest water level.

  25. Recommendation Options • Decrease cage culture area • Decrease stocking density • Introduce feeding system which will support non feeding cage culture system too. • Currently Government has chosen recommendation # 2 and has asked cage culture farmer to reduce stocking density by 50% (10 to 5/m3)

  26. Thank you

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