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.
EMS, more technically known as Acute Hepatopancreatic Necrosis Syndrome (AHPNS), has had a significant impact on shrimp production in Southeast Asia. The research results are encouraging because they provide shrimp farmers with a tool to improve management of the disease in ponds.
The research was conducted at Agrobest Sdn. Bhd. 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 ponds have greatly improved with management of pH to avoid the zone of EMS susceptibility.
These findings come about six weeks after a research team led by Dr. Donald Lightner at the University of Arizona reported that EMS is caused by a bacterial agent. Lightner’s research will also be featured in the July-August edition of the Advocate. 研究顯示EMS或由蝦塘環境引發
中國水產頻道獨家報道，在對馬來西亞一個大型綜合性養蝦場的研究表明，早期死亡綜合癥（EMS）在池塘水體pH值為8.5-8.8時極易暴發。
這個結論來自Noriaki Akazawa博士的文章，他是Agrobest有限公司總經理，并得到日本國近畿大學和日本水產養殖國家研究所的協助。完整的研究結果將在在全球水產養殖聯盟的雙月刊雜志《Global Aquaculture Advocate》7-8月刊上發表。
EMS，更專業的名稱是急性肝壞死綜合癥（ahpns），已對東南亞對蝦生產產生了顯著的影響。這個研究結果令人鼓舞，因為它們提供了蝦農可通過一定手段或方法來改善池塘的疾病管理。
這項研究是在Agrobes有限公司馬來西亞彭亨州的農場里進行的，它們461個地膜池塘分別養殖太平洋白蝦和黑虎蝦。EMS首先在2011年1月初該養蝦場的五個放養蝦苗的池塘發現，這些蝦苗是從相同的孵化場約一個月前開始放養的。在兩個月內，該疾病已經蔓延整個蝦場。受感染的池塘，無論多大規格或放養多久的蝦一般死亡率可達70%至80%。
對大約80個受感染和未受感染的蝦塘在相同時間段的水質數據進行對比發現，幾個水質指標的差異可能與疾病的暴發有關。研究人員隨后在水族缸中對各種參數控制水平進行了重復試驗。這些試驗證實病情在較低的pH值（7左右）時受到抑制，在較高的pH值為（8.5～8.8）時極易暴發。Agrobest農場通過調節pH避免EMS敏感區，大大的提高了蝦塘對蝦存活率。
這些發現比美國亞利桑那大學Donald Lightner博士的研究——《EMS是由細菌引起的》的晚了六周。Donald Lightner博士的研究也將出現在《Global Aquaculture Advocate》7-8月刊上。（譯/中國水產頻道 羅丹） 相關新聞鏈接：
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