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| Effects of combined fillers on the water quality,growth of tilapia,and functional diversity of the microbial community in tilapia aquaculture water |
| Received:January 18, 2017 |
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| KeyWord:combined filler;tilapia;purification effect;microbial community;carbon metabolism |
| Author Name | Affiliation | E-mail | | SHI Lei-lei | Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China | | | FAN Li-min | Freshwater Fisheries Research Centre, Chinese Academy of Fishery Sciences, Fishery Eco-Environment Monitoring Center of Lower Reaches of Yangtze River, Ministry of Agriculture, Key Open Laboratory for Genetic Breeding and Aquaculture Biology, Wuxi 214081, China | | | CHEN Jia-zhang | Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China
Freshwater Fisheries Research Centre, Chinese Academy of Fishery Sciences, Fishery Eco-Environment Monitoring Center of Lower Reaches of Yangtze River, Ministry of Agriculture, Key Open Laboratory for Genetic Breeding and Aquaculture Biology, Wuxi 214081, China | | | BING Xu-wen | Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China
Freshwater Fisheries Research Centre, Chinese Academy of Fishery Sciences, Fishery Eco-Environment Monitoring Center of Lower Reaches of Yangtze River, Ministry of Agriculture, Key Open Laboratory for Genetic Breeding and Aquaculture Biology, Wuxi 214081, China | | | ZHAO Zhi-xiang | Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China | | | HU Geng-dong | Freshwater Fisheries Research Centre, Chinese Academy of Fishery Sciences, Fishery Eco-Environment Monitoring Center of Lower Reaches of Yangtze River, Ministry of Agriculture, Key Open Laboratory for Genetic Breeding and Aquaculture Biology, Wuxi 214081, China | | | WU Wei | Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China
Freshwater Fisheries Research Centre, Chinese Academy of Fishery Sciences, Fishery Eco-Environment Monitoring Center of Lower Reaches of Yangtze River, Ministry of Agriculture, Key Open Laboratory for Genetic Breeding and Aquaculture Biology, Wuxi 214081, China | wuw@ffrc.cn |
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| Abstract: |
| Combined fillers were used as attachment carriers for indigenous microorganisms to study their effects on the water quality, growth of tilapia, and functional diversity of the microbial community in tilapia aquaculture water. The results showed that the combined fillers affected the water quality by increasing the concentrations of nitrite, dissolved oxygen, and inorganic carbon and by decreasing the concentration of nitrate and pH values in these aquaculture systems. At the same time, the concentrations of ammonia nitrogen and total organic carbon in these systems presented falling trends. In addition, the combined fillers significantly increased weight gain in the tilapia and reduced the feed coefficients. Moreover, with the suspension density increasing, the feed coefficients decreased. The combined fillers reduced the number of bacterial strains, but it had no significant effect on the alpha diversity of microorganisms presented via the Shannon, Simpson, McIntosh, and richness indices for these aquaculture systems. Nevertheless, the combined fillers improved the utilization rate of carbohydrates, alcohols, and esters by microorganisms, and reduced these substances to amines and acids in the process. Furtherly, RDA analysis not only showed the differences in functional diversity of the microbial community between the treated group and the control group in these systems, but also showed that the variations in functional diversity of the microbial community were more related to the changes of DO, pH, and nitrate. To summarize, the combined fillers could reduce the number of bacterial strains and affect the functional diversity of the microbial community. In addition, they could effectively improve the water quality and promote the growth of tilapia. |
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