Effects of Green Alga Chlorella vulgaris on Microalga Community and Its Relationship with Environmental Factors in Pacific White Shrimp Litopenaeus vannamei Culture Ponds
YAO Dongmei, ZHANG Dajuan, ZHANG Shulin, ZHANG Ying
Key Laboratory of Aqua-ecology and Aquaculture of Tianjin, Fisheries College, Tianjin Agricultural University, Tianjin 300384, China
Abstract：In order to explore the effects of inoculation of green alga Chlorella vulgaris on the community structure of microalgae and its relationship with environmental factors in Pacific white shrimp Litopenaeus vannamei culture ponds, two culture ponds with the same conditions were selected as the control group without inoculation of the green alga and the experimental group with inoculation of the green alga every 10 days, and the changes in physical and chemical factors and microalgae community structure in each treatment group were monitored regularly. The results showed that a total of 36 genera (5 phyla) of microalgae were identified in the control group, and 38 genera (species) in 5 phyla were identified in the experimental group. The number of Chlorophyta species in the two ponds accounted for more than 60% of the total species. Compared with the control group, the average density of Cyanophyta was decreased by 76.32% and that of Chlorella increased by 70.32%. The analysis of community structure revealed that the structure of microalgae in the experimental group changed stably with better continuity, and the contribution rate of Microcystis aeruginosa was decreased significantly, while that of the alga was increased significantly. Based on the redundancy analysis of microalgae density and temperature, pH, dissolved oxygen, transparency, redox potential and other environmental physical and chemical factors, it was found that temperature, pH and dissolved oxygen had significant effects on phytoplankton density (P<0.01), while the other two environmental factors had poor effects on phytoplankton density. Compared with the control group, the average contents of nitrite and ammonia nitrogen in the test group were decreased by 47.27% and 44.26%, respectively. Therefore, the finding suggests that the C. vulgaris inoculation frequency be 10 days, and the inoculation be at 8:00.
姚冬梅, 张达娟, 张树林, 张迎. 小球藻对凡纳滨对虾池塘微藻群落的影响及与环境因子的关系[J]. 水产科学, 2022, 41(4): 581-588.
YAO Dongmei, ZHANG Dajuan, ZHANG Shulin, ZHANG Ying. Effects of Green Alga Chlorella vulgaris on Microalga Community and Its Relationship with Environmental Factors in Pacific White Shrimp Litopenaeus vannamei Culture Ponds. Fisheries Science, 2022, 41(4): 581-588.
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2022, Vol. 41 
