Cultivating Ulva seaweed in aquaculture effluent improves abalone growth
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1) The document discusses a study on cultivating Ulva seaweed in aquaculture effluent from abalone farms. Growing Ulva provided economic benefits by improving abalone growth rates and yields. 2) Ulva grew faster and yields were higher when cultured in abalone effluent compared to seawater, especially with increased water exchange rates and fertilization. 3) Integrating Ulva cultivation with abalone aquaculture improved water quality and provided a protein-rich food source for the abalone that increased their growth and profits for farmers.
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Cultivating Ulva seaweed in aquaculture effluent improves abalone growth
- 1. Robertson-Andersson, D. V .; Bolton, J. B.; Anderson, R. J. & Probyn, T. A. CULTIVATION OF ULVA IN AQUACULTURE EFFLUENT University of Cape Town seminar series 2003
- 2. OR You are what you eat… Manager of Marine Growers, Mr Connie Muller, says: " Our answer to the poaching problem-Breeding large enough abalone to catch the poachers or at least scare the hell out of them."
- 7. Longitudinal profile of tanks Transverse profile of tanks 5 m 1 m
- 9. Small tanks Medium tanks 0.5 m 1 m 1 m 1 m
- 10. 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
- 11. RESULTS RGR 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.
- 13. RESULTS SGR of Ulva from June ‘01 to October ‘02 in sea, Turbot & abalone effluent water at JSP.
- 15. RESULTS Myrionema strangulans (MS) BAD INFECTION DEAD HEALTHY INFECTED
- 16. RESULTS MS infestation of Ulva thalli
- 21. RESULTS Tissue Nitrogen vs. Thallus Colour Tissue nitrogen vs. thallus colour
- 22. RESULTS Tissue Nitrogen vs. Tissue Phosphorus Tissue N vs. Tissue P A S O N D J F M A M J J A
- 25. RESULTS ECONOMICS Abalone growth curves
- 26. 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
- 27. 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
- 28. 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
- 30. 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