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. 研究显示EMS或由虾塘环境引发
中国水产频道独家报道，在对马来西亚一个大型综合性养虾场的研究表明，早期死亡综合症（EMS）在池塘水体pH值为8.5-8.8时极易暴发。
这个结论来自Noriaki Akazawa博士的文章，他是Agrobest有限公司总经理，并得到日本国近畿大学和日本水产养殖国家研究所的协助。完整的研究结果将在在全球水产养殖联盟的双月刊杂志《Global Aquaculture Advocate》7-8月刊上发表。
EMS，更专业的名称是急性肝坏死综合症（ahpns），已对东南亚对虾生产产生了显着的影响。这个研究结果令人鼓舞，因为它们提供了虾农可通过一定手段或方法来改善池塘的疾病管理。
这项研究是在Agrobes有限公司马来西亚彭亨州的农场里进行的，它们461个地膜池塘分别养殖太平洋白虾和黑虎虾。EMS首先在2011年1月初该养虾场的五个放养虾苗的池塘发现，这些虾苗是从相同的孵化场约一个月前开始放养的。在两个月内，该疾病已经蔓延整个虾场。受感染的池塘，无论多大规格或放养多久的虾一般死亡率可达70%至80%。
对大约80个受感染和未受感染的虾塘在相同时间段的水质数据进行对比发现，几个水质指标的差异可能与疾病的暴发有关。研究人员随后在水族缸中对各种参数控制水平进行了重复试验。这些试验证实病情在较低的pH值（7左右）时受到抑制，在较高的pH值为（8.5～8.8）时极易暴发。Agrobest农场通过调节pH避免EMS敏感区，大大的提高了虾塘对虾存活率。
这些发现比美国亚利桑那大学Donald Lightner博士的研究——《EMS是由细菌引起的》的晚了六周。Donald Lightner博士的研究也将出现在《Global Aquaculture Advocate》7-8月刊上。（译/中国水产频道 罗丹） 相关新闻链接：
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