星洲红鱼对温度适应性的研究

本文以20℃为试验起始温度,分别对星洲红鱼进行温度渐变(每天升温或降温1℃/d,速度控制在每12 h升或降0.5℃)和突然升高(2℃、4℃、6℃、8℃、10℃、12℃、14℃、16℃、18℃、20℃)以及突然下降2℃、4℃、6℃、8℃、10℃、12℃、14℃)实验,逐渐升温和降温实验表明:星洲红鱼对温度的适应范围8～40℃,生存温度14～36℃,临界死亡低温为(7.82±0.21)℃,致死低温为(5.67±0.16)℃,临界死亡高温为(38.36±0.21)℃,致死高温为(39.83±0.15)℃。突然升温和降温实验表明星洲红鱼对高温的适应性强,可适应突然上升16℃的升幅(20℃→36℃),对突然下降仅能适应8℃的降幅(20℃→12℃)。

The study on the temperature tolerance of Red Tilapia

In this paper,the temperature tolerance of Red Tilapia was studied under the condition that 20℃ was the initial temperature with gradually change of water temperature（increasing or decreasing 1℃ everyday,at the rate of 0.5℃ per 12 hours）,suddenly increase（2℃,4℃,6℃,8℃,10℃,12℃,14℃,16℃,18℃,20℃）,and suddenly decrease（2℃,4℃,6℃,8℃,10℃,12℃,14℃）,respectively.In gradually increasing and decreasing water temperature experiments,the results showed that the adaptation temperature of Red Tilapia was in the range from 8℃ to 40℃,and the critical survival temperature was from 14℃ to 36℃.The death temperature,the lethal temperature,the critical lethal temperature and the fatal high temperature were（7.82 ± 0.21）℃,（5.67 ± 0.16）℃,（38.36 ± 0.21）℃,（39.83 ± 0.15）℃,respectively.With suddenly change of water temperature,the results showed that Red Tilapia was able to adapt the suddenly increase change of 16℃（20℃→36℃）,and only adapt the suddenly decrease change of 8℃（20℃→12℃）.