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实验用施氏鲟(AcipenserschrenckiiBrandt)幼鱼为黑龙江捕获的野生亲本经人工繁殖、培育所得,8月龄,体长(32 63±1 80)cm,实验周期35d。实验设计了4个水温处理组,实验水温分别为17℃、20℃、23℃和26℃,实验观察到,生活在不同水温环境中的幼鱼表现出不同的生长特性,养殖在23℃温度环境中的施氏鲟幼鱼的生长速度显著高于其他处理组幼鱼,水温对施氏鲟的特定生长率(SGR)、日增重(DWG)、食物转化率(FCR)和摄食率(FR)有着显著的影响。这些参数与水温(T)之间的相关关系可用二次回归曲线来描述,生长率与水温的回归方程式为:SGR=-12 933+1 418T+(-0 033)T2,摄食率与水温的关系式为:FR=-5 324+0 719T+(-0 016)T2。根据回归方程,求得施氏鲟幼鱼的最适生长水温为21 53℃,最大摄食率的水温为22 33℃。结论认为,施氏鲟在水温17～26℃都可摄食生长,但在20℃时最适宜;同时证实,施氏鲟最适生长温度要低于其最适摄食温度。
The experimental Acipenserschrenckii Brandt juveniles were artificially propagated and cultivated at 8 months of age with body length of (3263 ± 1 80) cm and experimental period of 35 days. The experimental design of the four water temperature treatment group, the experimental water temperature were 17 ℃, 20 ℃, 23 ℃ and 26 ℃, the experiment was observed, living in different water temperature environment of juvenile fish showed different growth characteristics, breeding at 23 ℃ temperature The growth rate of juvenile Acipenser schrenckii was significantly higher than that of other treatment groups. The specific growth rate (SGR), daily gain (DWG), food conversion rate (FCR) and feeding rate FR) has a significant impact. The correlation between these parameters and water temperature (T) can be described by a second-order regression curve. The regression equation of growth rate and water temperature is: SGR = -12 933 + 1 418T + (- 0 033) T2, The formula is: FR = -5 324 + 0 719T + (- 0 016) T2. According to the regression equation, the optimal temperature of juvenile Acipenser schrenckii was 21 53 ℃, and the temperature of maximum feeding rate was 22 33 ℃. The conclusion is that Acipenser schrenckii can feed at 17 ~ 26 ℃ water temperature, but it is most suitable at 20 ℃. At the same time, the optimum growth temperature of Acipenser schrenckii is lower than its optimum temperature.