Abstract：In this study, the biofloc culture experiment was carried out under different salinity (10, 15, 20, 25 and 30) conditions in Pacific white shrimp Litopenaeus vennamei to study the effect of salinity on the water quality of biofloc culture and the growth and enzyme activity of the shrimp. The initial amount of biofloc was 20 mL/L, the density of prawns was 500 ind/m3, and the experimental period was 30 d. The results showed that the maximal body weight growth rate (70.73%) was observed at salinity 15 and 20, and the minimal body weight growth rate (50.24%) was observed at salinity 10. The higher the salinity, the faster the growth of the bioflocs. The 17-day biofloc sedimentation in the salinity 30 group reached 200 mL/L, and then was gradually decreased. The same trend change was observed in the other groups. The total alkalinity and pH of the water continued to be decreased during the experiment, without significant difference among the different groups (P>0.05). Ammonia nitrogen accumulation was at the fastest rate in the salinity 30 group, with the maximum concentration of 8.62 mg/L on the 6th day, then decreased to 0 mL/L, at the salinity 10 group the rate was accumulated the slowest, and also reached the maximum concentration on the 6th day, 1.71 mg/L, then decreased to 0 mg/L, and the other groups showed the same trend. The higher the salinity, the faster the ammonia nitrogen accumulation, and in the salinity 30 group the maximum concentration of 8.62 mg/L was found on the 6th day, then decreased to 0 mL/L, and the other groups showed the same trend. The lower the salinity, the faster the nitrite accumulation. In the salinity 10 group the maximum concentration of 9.18 mg/L was found on the 6th day, then decreased to 0 mL/L, and the other groups showed the same trend. Nitrate nitrogen level was increased in the early stage with different salinity, and declined slowly after the 16th day. There was significantly higher amylase activity in the salinity 15 group than that in the other groups, without difference among the other groups. The maximal lipase activity at salinity 25, and the salinity is increased or the enzyme activity is decreased. The SOD, AKP and ACP activities were maintained at a high level between 15 and 25 salinity. At the same salinity, the muscle enzyme activity was lower than that in the liver.
秦海鹏, 杨世平, 王博, 廖栩峥, 胡世康, 赵吉臣, 何子豪, 孙成波. 不同盐度对生物絮团、对虾生长以及酶活性的影响[J]. 水产科学, 2020, 39(3): 400-406.
QIN Haipeng, YANG Shiping, WANG Bo, LIAO Xuzheng, HU Shikang, ZHAO Jichen, HE Zihao, SUN Chengbo. Effect of Salinity on Biofloc Culture, Growth and Enzyme Activity in Pacific White Shrimp Litopenaeus vannamei. Fisheries Science, 2020, 39(3): 400-406.
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2020, Vol. 39 
