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June 11, 2013


Environmental Trigger For EMS Identified In Shrimp Ponds


“Research conducted on early mortality syndrome (EMS) at a large integrated shrimp farm in Malaysia has indicated that the disease repeatedly manifests in ponds with an increase in pH to 8.5 to 8.8.”


“Conducted by Noriaki Akazawa, managing director of Agrobest. Sdn., Bhd., with assistance from Kinki University and the National Research Institute of Aquaculture in Japan, the Ph.D. research is featured in an article in the upcoming July-August edition of the Global Aquaculture Advocate, the Global Aquaculture Alliance’s bimonthly magazine.  The full research results are being prepared for publication in a peer-reviewed journal.”


“The research was conducted at Agrobest’s farm in Pahang, Malaysia, which produces Pacific white shrimp and black tiger shrimp in 461 plastic-lined ponds.  EMS first appeared at the farm in early January 2011 in five ponds stocked with postlarvae from the same hatchery about one month earlier.  Within two months, the disease had spread throughout the farm.  Typical mortality in the affected ponds was 70% to 80%, and all ages and sizes of shrimp were affected.”


“A review of water quality data from approximately 80 affected and unaffected ponds stocked during the same month indicated several water quality differences that were correlated with outbreaks.  The researchers then conducted replicated aquarium trials with controlled levels of various parameters.  These tests confirmed that the disease repeatedly regressed at lower pH (around 7) and manifested at higher pH (8.5 to 8.8).  Survival rates in Agrobest’s ponds have greatly improved with management of pH to avoid the zone of EMS susceptibility.”


“GAA is committed to promoting responsible aquaculture through its various communications vehicles, including the Advocate, and its Best Aquaculture Practices certification program.  EMS is among the topics that will be addressed at GAA’s GOAL 2013 conference in Paris, France, from Monday, October 7, 2013.”


Information: Noriaki Akazawa, Agrobest (M) Sdn., Bhd., Batu 20 Jalan Pekan Nenasi, Kampung Tanjung Batu Nenasi, 26680 Pekan, Pahang Darul Makmur, Malaysia (phone 609-421-1888, fax 609-422 7895).


Source: The Global Aquaculture Alliance.  News Release.  Environmental Trigger For EMS Identified In Shrimp Ponds.  June 11, 2013.


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