Following on from a successful presentation to the Reciculation council members earlier in 2004, I was asked to make this presentation which should be titled why abalone farmers should grow seaweeds.

1. SEAWEED PADDLE POND SYSTEMS

3. SEAWEED PADDLE POND SYSTEM EFFLUENT CHANNEL INLET

4. SEAWEED PADDLE POND SYSTEM INLET

5. SEAWEED PADDLE POND SYSTEM SLUICE GATE

6. SEAWEED PADDLE POND SYSTEM INLET

7. SEAWEED PADDLE POND SYSTEM PADDLE AND DRIVE

8. SEAWEED PADDLE POND SYSTEM POND PROFILE VIEW

9. SEAWEED PADDLE POND SYSTEM PADDLE WHEEL

10. SEAWEED PADDLE POND SYSTEM MIDDLE DIVIDER WALL

11. SEAWEED PADDLE POND SYSTEM OUTLET BARRIER

12. SEAWEED PADDLE POND SYSTEM OUTLET

13. SEAWEED PADDLE POND SYSTEM EFFLUENT AND HARVESTING CHANNEL

14. SEAWEED PADDLE POND SYSTEM HARVESTING AREA

15. SEAWEED PADDLE POND SYSTEM PARENT STOCK

16. SEAWEED PADDLE POND SYSTEM PADDLE POND DESIGN

17. SEAWEED PADDLE POND SYSTEM COST OF A SINGLE POND 3500 Elec cable for supply and D. B. 94165 TOTAL 6840 Civils to level out & compact platform @ R25/m2 350 Sluice gate for incoming water 11700 Channel @ R650/m X 18 450 Cover for elec motor (fibreglass) 9000 Paddle and bearings 10400 Elec motor and gearbox 3 KW & chain & sprockets 225 S/S screws 40 mm X 4.2 mm X 500/pond 1500 Coverstrips 8 mm X 40 mm X 120 m HDPE 8800 HDPE white liner 750 micron 2 X 6 X 38 m 1400 Sand floor (compacted) 40000 Concrete casted

20. RESULTS Tissue Nitrogen vs. Thallus Colour Tissue nitrogen vs. thallus colour

21. RESULTS Tissue Nitrogen vs. Tissue Phosphorus Tissue N vs. Tissue P A S O N D J F M A M J J A

22. West Coast

25. RESULTS Temperature in a recirculation system Temperature 15 16 20 00 04 08 12 16 20 00 04 08 12 16

26. RESULTS Temperature in a recirculation system Temperature 15 16 20 00 04 08 12 16 20 00 04 08 12 16

27. RESULTS ammonium levels in recirculated tanks range between 0.003 - 0.005 u g N.L -1 ammonium levels in abalone flow through tanks = 0.01 u g N.L -1 Ammonium levels

31. SEAWEED PADDLE POND SYSTEM PRODUCTION FIGURES PRODUCTION = 1.3 tons of nutrient rich seaweed every second working day from paddle ponds AT PRESENT = 12 platforms Each requiring an average of 1.8 tons of kelp per week A four week 50 % rotation diet would require 900 kg cultivated seaweed in a month per platform. Therefore total platform cultivated seaweed demand = 10.8 Tons 16 ponds are capable of producing 13.2 tons of seaweed in a month

32. SEAWEED PADDLE POND SYSTEM PRODUCTION FIGURES This means that we have an excess of 2.4 tons which could feed another 2 platforms. 10.8 tons of kelp costs R115 000 now Thus the ponds have a direct saving of R115 000. There is also the benefit of faster growth rates and increased production with the same running costs due to the abalone being fed a protein rich diet

33. SEAWEED PADDLE POND SYSTEM ECONOMICS

34. SEAWEED PADDLE POND SYSTEM ECONOMICS Abalone growth curves

35. SEAWEED PADDLE POND SYSTEM 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

36. SEAWEED PADDLE POND SYSTEM Increase in SGR: 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

37. SEAWEED PADDLE POND SYSTEM I & J farm (120 tons @ 100 g per abalone) = 1 2000 000 100g abalone X R 1.50 or R 2.60 EQUALS Savings: R 1.8 – R 3.12 million ECONOMICS