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对人工刚孵化出膜的卵黄囊期仔鱼至 3周龄南方鲶幼鱼进行 15°C ,18°C ,2 1°C ,2 4°C ,2 8°C ,32°C及常温 (16 8°C～ 2 3 6°C)条件下的养殖试验 .定时观察其发育状况 ,测定体长、体质量 .发现温度极显著影响南方鲶幼鱼的发育 .统计分析表明 :温度对南方鲇的生长具有明显的影响 ,生长率随着温度的上升而增加 ,在 2 8°C达到最大值 ,而在 32°C反而下降 ,2 8°C与其他温度梯度的生长率相比具有极显著的差异 .回归分析证明各温度梯度的体长 (l)、体质量 (m)均符合关系式m =alb(a ,b为常数 ) .生长率 (r)与温度 (t)相关关系式为 :r=- 1 4188+ 0 0 997t- 4 0× 10 -5- 5t3通过求导推算极值的方法 ,求得该种鱼的最适生长温度为 2 8 82°C ,此时的最大生长率推算值为0 497g/周
Artificial hatched yolk sac larvae to 3 weeks old Southern catfish juvenile 15 ° C, 18 ° C, 2 1 ° C, 2 4 ° C, 2 8 ° C, 32 ° C and room temperature (16 8 ° C ~ 2 3 6 ° C) under the conditions of the breeding test.Observe the development of regular observation of body length, body weight.It was found that temperature had a significant impact on the development of southern catfish juvenile.Statistical analysis showed that: Growth has a significant impact, the growth rate increases with increasing temperature, reaching the maximum at 2 8 ° C, but decreased at 32 ° C, 2 8 ° C compared with other temperature gradient growth rate has extremely significant The regression analysis showed that the body length (l) and body mass (m) of all temperature gradients are in accordance with the relation m = alb (a and b are constants) .The correlation between growth rate (r) and temperature r = - 1 4188+ 0 0 997t- 4 0 × 10-5 5t3 The optimal growth temperature for this species of fish is found to be 2 8 82 ° C by deriving the extremum of the estimate, and the maximum growth rate is then calculated The value is 0 497g / week