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12 129 Gunawardana P.V.S.L

Duch cannel

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12 129 Gunawardana P.V.S.L

  1. 1. Variation of some physiochemical parameters along a part of the Dutch cannel in North Western Province of Sri Lanka P.V.S.L. Gunawardena U.P.K. Epa M. Hettiarachchi University of Kelaniya
  2. 2. Introduction <ul><li>Interest in shrimp farming developed in late 1970s. </li></ul><ul><li>Total area for prawn farming is approximately 1200 ha. </li></ul><ul><li>Majority of shrimp farms are in NWP. </li></ul><ul><li>>70% of farms are in the coastal areas around the Dutch Canal and Mundel Lagoon ecosystems . </li></ul>
  3. 4. Introduction cont……. <ul><li>The Dutch Canal alone is the main source of water for approximately 850 ha of prawn ponds. </li></ul><ul><li>Naturally abundant in fish, crustacean, and molluscan resources. </li></ul><ul><li>Unfortunately, however, Dutch Canal is also the main water body receiving farm effluents. </li></ul>
  4. 5. Introduction cont……. <ul><li>There is a strong potential for direct contamination of source waters. </li></ul><ul><li>Water exchange is very slow in some parts. </li></ul><ul><li>Unfortunately, much less information is available on the impact of prawn-farming on coastal water bodies . </li></ul>
  5. 6. Objectives <ul><li>Evaluate levels of some physiochemical parameters along part of the Dutch channel. </li></ul><ul><li>Relate levels of physiochemical factors with farming practices of those areas. </li></ul>
  6. 7. Methodology <ul><li>Five sampling points </li></ul><ul><li> Karukkupane </li></ul><ul><li>Nalladarankattuwa </li></ul><ul><li>Muthupanthiya </li></ul><ul><li>Udappuwa </li></ul><ul><li>Madurankuliya </li></ul><ul><li>Water samples (250ml) </li></ul><ul><li>- Top </li></ul><ul><li>- Bottom </li></ul><ul><li>Sampling duration – Biweekly from September 2008 to September 2009 </li></ul>
  7. 8. Methodology cont……. <ul><li>Parameters </li></ul><ul><li>Temperature, pH, Dissolved Oxygen, Turbidity, Salinity </li></ul><ul><li>Biological Oxygen Demand, Ammonia, TDS, Conductivity, Total Phosphorus and Chlorophyll a </li></ul>On the field In the laboratory after preserving
  8. 9. Results and Discussion <ul><li>Top water layers </li></ul><ul><li>Among Physical parameters, </li></ul>Parameter Average Values ± Standard error Karukkupane Nalladarankattuwa Muthupanthiya Udappuwa Madurankuliya TDS 11207 ± 1053 ppm 11560 ± 1266 ppm 13869 ± 728 ppm 14532± 1023 ppm 12873± 1108 ppm Conductivity 27.5 ± 8.4 mS/cm 32.5 ± 7.8 mS/cm 17.6 ± 9.2 mS/cm 17.3 ± 8.6 mS/cm 19.6± 7.3 mS/cm Turbidity 24± 7.3 NTU 11± 7.4 NTU 31± 11.1 NTU 28 ± 7.6 NTU 45 ± 13.4 NTU Salinity 22ppt ± 9 24 ppt ± 9 18 ppt ± 9 23ppt ± 7 19ppt ± 8 DO 4.03±0.9 mg/l a 3.42±0.9 mg/l a 4.79±2.0 mg/l b 5.75±2.2 mg/l b 4.60±1.1mg/l b BOD 2.8±1.8 mg/l 2.3±1.3 mg/l 3.5±1.6 mg/l 4.5±1.7 mg/l 4.6±1.5 mg/l Temperature 29.5±1.5 o C a 30.5±2.0 o C b 31.0±1.5 o C b 31.0±1.5 o C b 31.5±1.0 o C b pH 7.8±0.3 a 7.7±0.3 a 7.9±0.4 b 8.0±0.5 b 8.3±0.4 b
  9. 10. Variation of temperature in top water levels Temperature o C Karukkupane Muthupanthiya Nalladarankattuwa Udappuwa Madurankuliya
  10. 11. Variation of Dissolved Oxygen in top water DO level (mg/l) Karukkupane Muthupanthiya Nalladarankattuwa Udappuwa Madurankuliya
  11. 12. Variation of pH in top water levels pH Karukkupane Muthupanthiya Nalladarankattuwa Udappuwa Madurankuliya
  12. 13. Variation of Chemical and biological factors Parameter Karukkupane Nalladarankattuwa Muthupanthiya Udappuwa madurankuliya PO 4 -3 0.046 mg/l ± 0.025 0.047mg/l ± 0.021 0.018mg/l ± 0.007 0.104mg/l ± 0.261 0.030mg/l ± 0.048 [NH 3 ] 0.120 mg/l ± 0.087 0.041 mg/l ± 0.020 0.076 mg/l ± 0.039 0.215 mg/l ± 0.096 0.226 mg/l ± 0.097 [Chlorophyll a] 24.00 mgm -3 6.63 a 12.76mgm -3 5.26 b 20.55mgm -3 4.21 b 29.56 mgm -3 7.74 a 32.85 mgm -3 18.27 c Average value ± std. error
  13. 14. Variation of Chlorophyll a concentration Chlorophyll a level ( mgm -3 ) Karukkupane Muthupanthiya Nalladarankattuwa Udappuwa Madurankuliya
  14. 15. Bottom water layer <ul><li>Udappuwa and Madurankuliya resulted significantly higher levels of </li></ul><ul><li>Turbidity ( 21.8 ± 9.3 NTU and 35.3± 7.6 NTU ) </li></ul><ul><li>pH ( 9.3 ± 1.4 and 10.2 ± 1.2) </li></ul><ul><li>NH3 + ( 0.22 ± 0.008 mg /l and 0.38 ± 0.006 mg/l) </li></ul><ul><li>PO4 -3 ( 0.048 ± 0.005 mg/l and 0.106 ± 0.004 mg/l) </li></ul><ul><li>BOD ( 2.53 ± 0.60 and 3.41 ± 0.8 mg/l ) </li></ul>
  15. 16. Variation of bottom turbidity places Turbidity (NTU) Karukkupane Muthupanthiya Nalladarankattuwa Udappuwa Madurankuliya
  16. 17. Variation of bottom pH in different palaces pH Karukkupane Muthupanthiya Nalladarankattuwa Udappuwa Madurankuliya
  17. 18. Variation of NH3 NH3 Concentration (mg /l) Karukkupane Muthupanthiya Nalladarankattuwa Udappuwa Madurankuliya
  18. 19. Variation of bottom BOD BOD (mg/l) Karukkupane Muthupanthiya Nalladarankattuwa Udappuwa Madurankuliya
  19. 20. Variation of bottom PO4 -3 PO4 -3 concentration (mg/l) Karukkupane Muthupanthiya Nalladarankattuwa Udappuwa Madurankuliya
  20. 21. Conclusion <ul><li>Top water samples showed significantly higher levels Chlorophyll a at Karukkupane, Udappuwa and Madurankuliya. </li></ul><ul><li>Bottom water layers of different sites resulted significantly higher levels of </li></ul><ul><li>Turbidity </li></ul><ul><li>pH </li></ul><ul><li>NH3 </li></ul><ul><li>PO4 -3 at Udappuwa and Madurankuliya </li></ul><ul><li>and </li></ul><ul><li>BOD at Muthupanthiya, Udappuwa and Madurankuliya </li></ul>
  21. 22. <ul><li>Karukkupane </li></ul><ul><li>Nalladarankattuwa </li></ul><ul><li>Muthupanthiya </li></ul><ul><li>Udappuwa </li></ul><ul><li>Madurankuliya </li></ul>
  22. 23. Suggesions <ul><li>Complimentary treatment systems be established to improve the quality of the receiving water, specially in the areas like Udappuwa, Madurankuliya and Muthupanthiya. </li></ul><ul><li>Awareness of resource user of there areas on possible impacts of elevated levels of these parameters on their activities. </li></ul>
  23. 24. Thank you
  24. 25. ` Karukkupane Nalladarankattuwa Muthupanthiya Udappuwa Madurankuliya

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