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Feeding Patterns of Prawns by Peter Blyth Acknowledgements

Feeding Patterns of Prawns by Peter Blyth Acknowledgements Gold Coast Marine Aquaculture, Jacobs Well, QLD CSIRO (CMAR), Cleveland, QLD TAWEE Farm, Thailand Bayer, Thailand Faculty of Fisheries, Kasetsart University, Thailand. Factors that impact on Feeding. Water Temperature Oxygen

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Feeding Patterns of Prawns by Peter Blyth Acknowledgements

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  1. Feeding Patterns of Prawns by Peter Blyth Acknowledgements Gold Coast Marine Aquaculture, Jacobs Well, QLD CSIRO (CMAR), Cleveland, QLD TAWEE Farm, Thailand Bayer, Thailand Faculty of Fisheries, Kasetsart University, Thailand

  2. Factors that impact on Feeding • Water Temperature • Oxygen • Feed composition • Spatial feed distribution • Biomass/stocking density • Moon phase/moulting • Size • Barometric pressure/salinity/rainfall • Predators • Timing of feeding • Behavioural (competition) • Chemical composition of water (pH, ammonia etc) • Pond flora and fauna • disease

  3. Atlantic salmon Salmo salar

  4. Feeding to Rationoptimum Under Feeding - Over Feeding

  5. Reduced Environmental Impact – Cage culture (sea bass in EU) AQ1 Feeding Control Average = 23.5% (SD ± 1.38) decrease in predicted sediment carbon input over the production period

  6. Pellet leaching After Smith et. al., 2002

  7. Equipment: SF200 Sound Feeding System • System Components • Hydrophone • Controller • DO/Temp Probe • Management Software • Enviro. alarms Comprised a CORTEX-A8 microprocessor, HTI-96-MIN hydrophone, Sterner circular 12VDC. Data communications was via WLAN to a PC managed by AQPC software

  8. Delivery Methods Blower + feed tray By hand +feed tray Feeder + hydrophone Feeder+ feed tray

  9. Auto-feederssingle or three phase circular spreaders

  10. Instantaneous feed response L.vannamei P.monodon

  11. Black Tiger Farm Gold Coast Marine Aquaculture • Jacobs Well, SE Queensland • P. monodon • X53 -1h ponds and several 0.3h ponds • Annual production ~500-700 • Use CP and Ridley Aquafeed pellets • 1 crop per year • Salinity range 20-40ppt • Temperature range 20-30°C

  12. Trial 2: SF200r auto in Commercial Pond • 1 hectare ponds • Pond 1 - SF200r/ 4 auto-feeders G18 • Pond 2 control (compared to Hand fed G17 • Both stocked in 25th Sept 2010; • SF200 pond – 392,000, Blow-Fed 368,000 pl’s each

  13. Tawee White shrimp farm Surat Thani, Thailand L. vannamei X200 -1h ponds Use CP 2 crops per year Salinity range 12-20ppt Temperature range 24-30°C

  14. Ration and Temperature

  15. SF200 Auto(G18) Vs Hand Fed (G17)

  16. Results

  17. GCMA- Variation in feeding activity, dissolved oxygen and water temperature over one typical day.

  18. Tawee - diurnal variation in feeding activity, temperature and DO

  19. Feeding ration switch nocturnal-diurnal due to temperature

  20. Spatial Distribution - Feed spread comparison1 h pond • vannamei up to x 3.5 times more dense in the feeding area • vannamei reported to utilise entire water column • rate of intake therefore more rapid with vannamei

  21. Feed control - Feeder output in relation to wind and position

  22. Summary • Regulates instantaneous feeding rate • Controls feed delivery rate 24/7 – • Feeds to appetite or ration without waste • Measures feeding activity continuously cf. feed tray every 2-3hours. • System improves FCR & growth • Feed all ponds: • At the best time for the prawns • Environmental monitoring and alarms for key parameters - DO, temperature, power

  23. Thank you

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