Investigation of Toxic Cyanobacteria in North Thailand

泰国北部有毒蓝藻调查

• 批准号: 21040412
• 负责人: ITAYAMA Tomoki
• 金额: --
• 依托单位: Nagasaki University
• 依托单位国家: 日本
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21040412/
• 关键词: タイ; 養魚池; 藍藻; 藍藻毒microcysti; mcy遺伝子; 定量PCR; microcystin分解菌

We found toxic cyanobacteria such as Microcystis sp. in almost investigated fish ponds(including the experimental fish ponds of Maejo University) in North Thailand. Especially, the amount of toxin producing cyanobacteria in the catfish pond was much than that in the tilapia ponds. However we also found the high ratio of non-toxin-producing strains of Microcystis sp. in such fish ponds by a cyanotoxin microcystin analysis and qPCR for the microcystin synthetase mcy genes. A few amount of microcystin was detected from several fishes in the experimental ponds in Maejo University. On the other hand, musty odors substances produced by cyanobacteria were detected in many fishes and in many ponds. Therefore, because we thought that it is important to clarify such fish ponds using a bio-fence type biological filtration method, we conducted a preliminary experiment and mathematical analysis of purification process of the ponds. As a result, we presented that the bio-fence method should be developed as an adequate eco-engineering for safe fish production in aquaculture.

我们在泰国北部几乎被调查的鱼塘（包括前jo大学的实验鱼塘）中发现了有毒的蓝藻，如微囊藻。特别是鲶鱼池中产毒蓝藻的数量明显多于罗非鱼池。然而，通过对微囊藻毒素和微囊藻毒素合成酶基因的qPCR分析，我们也发现这些鱼塘中不产毒的微囊藻菌株比例很高。在前市大学实验池塘的几种鱼类中检测到少量微囊藻毒素。另一方面，在许多鱼类和许多池塘中检测到由蓝藻产生的霉味物质。因此，由于我们认为采用生物栅栏式生物过滤方法对这类鱼塘进行净化很重要，我们对鱼塘的净化过程进行了初步的实验和数学分析。因此，我们提出生物围栏技术应该作为一种适当的生态工程来发展，以保证水产养殖中鱼类的安全生产。

项目成果

How microcystin-degrading bacteria express microcystin degradation activity

• DOI: 10.1111/j.1440-1770.2011.00480.x
• 发表时间: 2011-09
• 期刊: Lakes and Reservoirs: Research and Management
• 作者: K. Shimizu;H. Maseda;K. Okano;T. Itayama;Yukio Kawauchi;Rongzhi Chen;M. Utsumi;Zhenya Zhang;N. Sugiura

Norio Iwami and Tomoaki Itayama, Musty Odor in Tilapia(Oreochromis niloticus) Cultured in Cages and Earthen Ponds

Norio Iwami 和 Tomoaki Itayama，网箱和土池养殖罗非鱼（Oreochromis niloticus）的霉味

• 发表时间: 2010
• 期刊: Journal of Agricultural Research and Extension
• 作者: Niwooti Whangchai;Chayarat Pleumsumran;Siraprapa Fakrajang
• 通讯作者: Siraprapa Fakrajang

Water Purification by Bio-fence system

生物围栏系统净水

• 发表时间: 2011
• 作者: Tomoaki Itayama;Norio Iwami;Xue-Ying Bi;Dong Xia;Kazuya Shimizu;Korntip Kannika;Redel Gutierrez;Fumiaki Furusawa;Kohmsan Ruangdet;Niwooti Whangchai and Norio Sugiura
• 通讯作者: Niwooti Whangchai and Norio Sugiura

Development of Controlling Methods of Toxic Cyanobacteria in Eutrophicated Reservoirs

富营养化水库有毒蓝藻控制方法的研究进展

• 发表时间: 2009
• 作者: Tomoaki ITAYAMA;Nobuyuki TANAKA;Norio IWMAI;Takashi KUWABAAR;Niwooti WHANGCHAI
• 通讯作者: Niwooti WHANGCHAI