Comparative analysis of nitrogen and phosphorus budgets in a bioflocs aquaculture system and recirculation aquaculture system during over-wintering of tilapia (GIFT,Oreochromis niloticus) |
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| Affiliation: | 1. Shanghai Engineering Research Center of Aquaculture (Shanghai Science and Technology Committee), Shanghai Ocean University, Shanghai 201306, China;2. Key Laboratory of Freshwater Aquatic Genetic Resources (Ministry of Agriculture of PRC), Shanghai Ocean University, Shanghai 201306, China;3. National Demonstration Center for Experimental Fisheries Science Education (Ministry of Education of PRC), Shanghai Ocean University, Shanghai 201306, China;1. Institute of Agricultural Bio-Environmental Engineering, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China;2. Aquaculture and Fisheries Group, Department of Animal Sciences, Wageningen University, 6708 WD Wageningen, the Netherlands;1. Shanghai Engineering Research Center of Aquaculture, (Shanghai Ocean University), Shanghai Science and Technology Committee, Shanghai 201306, China;2. Key Laboratory of Freshwater Aquatic Genetic Resources, (Shanghai Ocean University), Ministry of Agriculture of PRC, Shanghai 201306, China;3. National Demonstration Center for Experimental Fisheries Science Education, (Shanghai Ocean University), Ministry of Education of PRC, Shanghai 201306, China;1. College of Fisheries and Life Sciences of Shanghai Ocean University, Shanghai 201306, China;2. Research and Development Center of Aquacultural Engineering of Shanghai, Shanghai 201306, China;3. Shanghai Collaborative Innovation Center for Aquatic Animal Genetics and Breeding, Shanghai 201306, China |
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| Abstract: | Nitrogen (N) and phosphorus (P) budgets in a bioflocs technology (BFT) aquaculture system and a recirculation aquaculture system (RAS) during over-wintering of tilapia (GIFT Oreochromis niloticus)for 64 d were compared in the current study. Fish feed was the major input of N in both systems, specifically, 94±0 % and 82±4 % for the RAS and BFT aquaculture system, respectively. The rate of N recovery in the BFT aquaculture systems was estimated to be 48±5 % of input N, which was significantly different from that of the RAS (37±4 %). There was no significant difference between the RASs and BFT aquaculture systems in terms of P recovery rate. The regular backwashing of the drum filter and biological filter in RAS accounted for 41 ± 2 % of input N and 39 ± 2 % of input P. Approximately 54 % of unassimilated nitrogen N was removed by nitrification in the BFT aquaculture systems. The results from the present study suggest that nitrification may be the dominant pathway for ammonia removal in a BFT aquaculture system rather than by heterotrophic bacterial assimilation. |
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| Keywords: | Nitrogen budget Phosphorus budget Bioflocs Technology Recirculating aquaculture system Over-Winter Tilapia |
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