tailieunhanh - Nghiên cứu nông nghiệp: Technical and economic feasibility of applying the Better Management Practices (BMP) to household aquaculture in Vietnam - MS2

The area of semi-intensive pond should from ha, with construction and input and output separation. Pond slope down to the store. Pond cleaning Before PL (Post-larvae) released 25-30 days, drainage ponds and pond drying 7-10 days. Plowing the pond bottom after removing the mud. If the bottom is acidic, water discharge repeated 2-3 times. | Australian Government Aus AID Ministry of Agriculture Rural Development 002 05 VIE Technical and economic feasibility of applying the Better Management Practices BMP to household aquaculture in Vietnam MS2 BMP PROTOCOL REPORT Nguyen Van Quyen PhD 1 Nguyen Xuan Suc MSc 1 Mai Van Ha MSc 1 Le Van Khoa PhD 1 Dinh Van Thanh 1 Virginia Mosk MSc 2 1 Research Institute for Aquaculture 2 Animal Biology University of Western Australia May 2007 I. POND PREPARATION Pond condition The area of semi-intensive pond should be from ha with well-constructed and separated inlet and outlet. Pond bottom should slope down to outlet. Pond cleaning Before PL Post-larva releasing 25-30 days draining out pond water and drying pond bottom from 7-10 days. Ploughing pond bottom after removing mud top-layer. If acidic bottom repeating water flushing 2-3 times. Ploughing on dry soil using tractor If can not drying pond bottom due to natural condition wet cleaning method should be applied. Using pump to drain pond bottom then using high pressure pump to remove mud top-layer. If acidic bottom repeating water flushing 2-3 times. Removing mud layer manually Pond liming Use of CaO and CaCO3 in the ratio of 2 1 for disinfection and bottom pH increasing. Pond bottom needs wetting and pH checking before lime application in order to experience of lime effectiveness and right application amount. Refer to below table as a reference pH bottom soil CaO ha CaCOs ha 6 1000 500 5-6 2000 1000 5 3000 1500 Lime application to pond bottom Water supplying Water before pumping into culture pond needs filtering and treating within reservoir using permitted chemicals and probiotics. Use of net bag fixed at 2 sides of pipe small mesh size for water filtering discarding unwanted foreign objects and predators from ponds. Suitable water depth is at least m. Water filtration by twin bag filter Water color inducting About 10 -15 days before stocking water color induction needs to be .

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