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Exploring the mechanism of a novel recirculating aquaculture system based on water quality parameters and bacterial communities

文献类型： 外文期刊

作者： Xiao, Gengfeng 1 ; Cheng, Xiangju 1 ; Zhu, Dantong 1 ; Li, Zhifei 3 ; Feng, Lijuan 1 ; Peng, Xiaoming 1 ; Lu, Zhuoyin 1 ; Xie, Jun 3 ;

作者机构： 1.South China Univ Technol, Sch Civil Engn & Transportat, Guangzhou 510640, Peoples R China

2.South China Univ Technol, State Key Lab Subtrop Bldg Sci, Guangzhou 510640, Peoples R China

3.Chinese Acad Fishery Sci, Pearl River Fisheries Res Inst, Guangzhou 510380, Peoples R China

关键词： Decomposition mechanism; Ecological pond; Wastewater treatment; Bacterial community; High-throughput sequencing

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：5.8； 五年影响因子：5.4 ）

ISSN： 0944-1344

年卷期： 2023 年 30 卷 12 期

页码：

收录情况： SCI

摘要： To mitigate the serious environmental problems caused by aquaculture wastewater discharge, the development of improved aquaculture systems with more self-purification capacity and less environmental impact has become essential. A novel recirculating aquaculture system (RAS) with ecological ponds was introduced. However, the mechanism of how the ecological ponds decompose the nutrients from the residual feed and excrement of fish is still unclear. Therefore, we designed a seven- week field experiment to explore the dynamic of water quality and the shift of bacterial communities during the initial stage of the RAS ecosystem to maintain the stability of the system. According to the result, the dissolved oxygen concentration maintained at 5.63 to 10.22 mg center dot L-1 in aquaculture water, and electrical conductivity increased by 100% to over 800 mu s center dot cm(-1). High-throughput sequencing showed that the abundance and diversity of the bacterial communities in sediment samples were significantly higher than in water samples, and the Proteobacteria, Bacteroidetes, Cyanobacteria, and Actinobacteria were dominant phyla in all samples. The relative abundance of ammonia-oxidizing archaea, ammoniaoxidizing bacteria, and nitrite-oxidizing bacteria was lower than 0.10, but rising. Redundancy analysis suggested that TOC, EC, NO3-, and NO2- were the most important factors shaping the bacterial communities in aquaculture water. Our studies assessed the RAS with ecological ponds for the first time based on water quality parameters and bacterial communities, which indicates that decomposition capacity is insufficient but improved at the initial stage of the operation, and potential risks like eutrophication require attention.

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