Shrimp farming intensification has impacted various diseases; one of these is white faeces disease (WFD). Factors that cause WFD remain unknown. The research analysed phytoplankton and bacteria abundance and community composition in intensive Pacific white shrimp farming during an outbreak of WFD. Composite sampling was conducted. Fifty litres of water samples were taken and filtered using a plankton net. Filtered water was preserved in bottle samples by adding 8–10 drops of Lugol solution and labelled. Bacteria were enumerated by total plate count. Symptoms began to appear on the 49th day of culture, which are the size of the shrimp that is smaller than the normal size, the soft carapace condition, the intestinal tract that is not filled, and the appearance of spots of white faeces on the surface of the water. The results showed that the number of Vibrio in the water and shrimp intestines infected with WFD was higher than the abundance of bacteria in the culture water and the normal intestine of shrimp. There were four phytoplankton classes: Bacillariophyceae, Chlorophyceae, Cyanophyceae and Dinophyceae. Phytoplankton abundance increased significantly in the WFD-infected pond.

中文翻译：

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太平洋白虾集约化养殖中的白粪病和大量细菌和浮游植物

对虾养殖集约化已经影响了各种疾病；其中之一是白粪病（WFD）。导致 WFD 的因素仍然未知。该研究分析了 WFD 爆发期间集约化太平洋白虾养殖中浮游植物和细菌的丰度和群落组成。进行了复合抽样。取五十升水样并使用浮游生物网过滤。过滤后的水通过加入 8-10 滴 Lugol 溶液保存在瓶样品中并贴上标签。通过总平板计数来计数细菌。养殖第49天开始出现症状，虾的体型比正常体型小，甲壳软，肠道未充盈，表面出现白色粪便斑点的水。结果表明，感染WFD的水体和虾肠中的弧菌数量高于养殖水体和正常虾肠中的细菌丰度。有四个浮游植物纲：芽孢杆菌科、绿藻科、蓝藻科和甲藻科。受 WFD 感染的池塘中浮游植物丰度显着增加。