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(huán)境引發(fā)
中國水產(chǎn)頻道獨(dú)家報道，在對馬來西亞一個大型綜合性養(yǎng)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(fā)。
這個結(jié)論來自Noriaki Akazawa博士的文章，他是Agrobest有限公司總經(jīng)理，并得到日本國近畿大學(xué)和日本水產(chǎn)養(yǎng)殖國家研究所的協(xié)助。完整的研究結(jié)果將在在全球水產(chǎn)養(yǎng)殖聯(lián)盟的雙月刊雜志《Global Aquaculture Advocate》7-8月刊上發(fā)表。
EMS，更專業(yè)的名稱是急性肝壞死綜合癥（ahpns），已對東南亞對蝦生產(chǎn)產(chǎn)生了顯著的影響。這個研究結(jié)果令人鼓舞，因為它們提供了蝦農(nóng)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(nóng)場里進(jìn)行的，它們461個地膜池塘分別養(yǎng)殖太平洋白蝦和黑虎蝦。EMS首先在2011年1月初該養(yǎng)蝦場的五個放養(yǎng)蝦苗的池塘發(fā)現(xiàn)，這些蝦苗是從相同的孵化場約一個月前開始放養(yǎng)的。在兩個月內(nèi)，該疾病已經(jīng)蔓延整個蝦場。受感染的池塘，無論多大規(guī)格或放養(yǎng)多久的蝦一般死亡率可達(dá)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(zhì)數(shù)據(jù)進(jìn)行對比發(fā)現(xiàn)，幾個水質(zhì)指標(biāo)的差異可能與疾病的暴發(fā)有關(guān)。研究人員隨后在水族缸中對各種參數(shù)控制水平進(jìn)行了重復(fù)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(fā)。Agrobest農(nóng)場通過調(diào)節(jié)pH避免EMS敏感區(qū)，大大的提高了蝦塘對蝦存活率。
這些發(fā)現(xiàn)比美國亞利桑那大學(xué)Donald Lightner博士的研究——《EMS是由細(xì)菌引起的》的晚了六周。Donald Lightner博士的研究也將出現(xiàn)在《Global Aquaculture Advocate》7-8月刊上。（譯/中國水產(chǎn)頻道 羅丹） 相關(guān)新聞鏈接：
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