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Effects of recirculating aquaculture model on water quality and growth performance of Litopenaeus vannamei
NIU Jiangbo, WU Zhaojun, LI Yasong, KANG Qiuping, XU Bo, GUO Bing, JIANG Liping, SONG Xiangguo, LIANG Qinlang
Journal of Fisheries Research    2023, 45 (3): 287-296.   DOI: 10.14012/j.cnki.fjsc.2023.03.009
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By analyzing the growth performance and water quality index differences of Litopenaeus vannamei under the recirculating aquaculture mode,the feasibility of the recirculating aquaculture mode in the aquaculture production was explored.The initial body mass of L.vannamei was (2.39±0.20) g.In this study,a recirculating aquaculture group (RAG) and a traditional industrial aquaculture group (IAG) were set up,with 3 replicates in each group.750 individuals of L.vannamei were stocked per cubic meter,and the salinity of the cultured water was 18.The aquaculture period was from July 23 to September 10,2022,lasting for 50 days.The results showed that the average water temperature of RAG was significantly higher than that of IAG (P<0.05),and the dissolved oxygen was 2.45% higher than that of IAG.The ammonia nitrogen of RAG was significantly lower than that of IAG during the culture period (P<0.01),and the nitrite nitrogen was 24.29% lower than that of IAG after the system matured and stabilized (12 days).Although the survival rate of RAG was 2.17% lower than that of IAG,but the final body mass,unit yield,specific growth rate and weight gain rate were all higher than those of IAG.The feeding rate and feed conversion rate of RAG were lower than those of IAG,but did not show significant difference (P>0.05),and the specific growth rate and geometric mean mass of each group showed a significant negative correlation (P<0.05).The comprehensive results showed that the recirculating aquaculture mode could effectively control the key water quality factor indicators at a low level,which played an important role in water resource conservation and environmental protection.In addition,in the practice of aquaculture production,the growth and production of L.vannamei could also be promoted to a certain extent,and this model had strong feasibility.

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