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Effects of temperature on growth, hematology, and immune responses of subadult Chinese sturgeon (Acipenser sinensis Gray 1835) under different ammonia nitrogen conditions in recirculating aquaculture system

文献类型： 外文期刊

作者： Zhang, Haigeng 1 ; Ni, Qi 1 ; Zhang, Yulei 1 ; Wu, Fan 1 ; Liu, Huang 1 ; Long, Lina 1 ; Guan, Chongwu 1 ;

作者机构： 1.Chinese Acad Fishery Sci, Fishery Machinery & Instrument Res Inst, Shanghai, Peoples R China

期刊名称：JOURNAL OF APPLIED ICHTHYOLOGY （ 影响因子：0.892； 五年影响因子：0.956 ）

ISSN： 0175-8659

年卷期： 2019 年 35 卷 1 期

页码：

收录情况： SCI

摘要： The growth, hematology, and immune responses of subadult Chinese sturgeon (Acipenser sinensis) (avg. wt. 25.11 +/- 3.74 kg) were determined at three water temperature levels (12, 18, and 24 degrees C) x three concentrations of total ammonia nitrogen (TAN) (0.05 +/- 0.02, 1.03 +/- 0.04, and 2.03 +/- 0.05 mg/L) for 90 days in recirculating aquaculture system (RAS). At the end of the experiment, all fish were weighed and serum was collected for analysis using biochemical parameters. The temperature level had significant effects on the growth and hematology responses of subadult Chinese sturgeon under the RAS conditions. The specific growth rate (SGR) of subadult Chinese sturgeon was highest at 18 degrees C compared to other temperatures; at this temperature, the total antioxidant capacity (T-AOC), alanine aminotransferase (ALT) and lysozyme (LZM) activities were also the highest (p < 0.05). As the temperature rose, the oxygen consumption rate and ammonia excretion rates significantly increased (p < 0.05). In addition, there was no effect of TAN level on ammonia excretion rates of subadult Chinese sturgeon, while the oxygen consumption rate was greater in the high TAN group compared with the other groups (p < 0.05). The SGR of the fish was markedly reduced when the TAN level rose, and blood urea nitrogen (BUN), blood ammonia (BA), malondialdehyde (MDA) and cortisol in the serum were significantly elevated when the fish were in high TAN water for 90 days (p < 0.05), T-AOC and LZM activities in the serum clearly decreased, indicating that the antioxidant system and nonspecific immune mechanism of subadult Chinese sturgeon appeared to be inhibited, which could raise the sensitivity of the Chinese sturgeon to various pathogens. The results of this study indicate that subadult Chinese sturgeon could achieve normal growth in the RAS, but that growth and hematology were significantly affected when the TAN concentration in the water was higher than 2 mg/L for an extended period.

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