CULTIVATION OF ULVA IN AQUACULTURE EFFLUENT
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This is a presentation at the Abalone Farmers Assosiation of Southern Africa project meeting in 2003. It details the progress we made from 2000 - 2002 on using seaweeds as biofilters in aquaculture effluent
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CULTIVATION OF ULVA IN AQUACULTURE EFFLUENT
- 1. Robertson-Andersson, D. V .; Bolton, J. B.; Anderson, R. J. & Probyn, T. A. CULTIVATION OF ULVA IN AQUACULTURE EFFLUENT AFASA project meeting 2003
- 6. Longitudinal profile of tanks Transverse profile of tanks 5 m 1 m
- 8. Small tanks Medium tanks 0.5 m 1 m 1 m 1 m
- 9. 0 1 2 3 4 5 6 7 8 sea shaded sea fert shaded fert abalone shaded abalone SGR % day -1 J J A S O N D J F M A M J J A S O RESULTS SGR of Ulva from June ‘01 to October ‘02 in sea, fertilized & abalone effluent water. (2) where water exchanges increased at I & J 2
- 10. RESULTS RGR of Ulva from June ‘01 to October ‘02 in sea, Turbot & abalone effluent water at JSP.
- 11. RESULTS SGR of Ulva from June ‘01 to October ‘02 in sea, Turbot & abalone effluent water at JSP.
- 12. RESULTS SGR of Ulva from June ‘01 to October ‘02 in sea, Turbot & abalone effluent water at JSP.
- 14. RESULTS Myrionema strangulans (MS) BAD INFECTION DEAD HEALTHY INFECTED
- 15. RESULTS MS infestation of Ulva thalli
- 20. RESULTS Tissue Nitrogen vs. Thallus Colour Tissue nitrogen vs. thallus colour
- 23. RESULTS ECONOMICS Abalone growth curves
- 24. RESULTS 31.2 % increase in weight using rotation diet vs kelp only diet over 9 months Cost: $30 per kg X R 8 = R 240 10 (100g) abalone in 1 kg cost per abalone = R 24 less profit and freight = R 15 per abalone ECONOMICS
- 25. RESULTS Increase in SGR: 49 – 68 % per year Normal Growth to 100g = 5 years accelerated growth = 3.3 – 3.6 years @ R 15 per abalone New cost : R 12.40 – R 13.50 per abalone Savings: 17 – 28 % R 1.50 - R 2.60 per abalone ECONOMICS
- 26. RESULTS Average farm (50 tons @ 100 g per abalone) = 500 000 100g abalone X R 1.50 or R 2.60 EQUALS Savings: R 800 000 – R 1.3 million ECONOMICS
- 28. THE END Thank you ACKNOWLEDGEMENTS I would like to extend special thanks to the following people and organizations without whose help this project would be impossible: I & J Mariculture farm particularly N. Loubser, H. Otto and L. Ansara JSP Mariculture farm particularly K. Ruck N R F Swedish and South African Collaborative Programme