摘要
为提高尼罗罗非鱼的抗寒能力,本试验采用室内水族箱养殖方法研究了尼罗罗非鱼在0‰、5‰、12‰、25‰4个盐度梯度下的低温耐受性。结果表明:就温度而言,死亡率随着温度的降低呈先上升后下降的趋势,温度达到9.1℃时,死亡率达到最大值,为38.7%;就盐度而言,盐度为5‰时的死亡率最低,当盐度上升至25‰时罗非鱼的死亡率最高,50%的个体的成活时间(ST50)由长至短排序为5‰>12‰>0‰>25‰;在不同的盐度梯度下,尼罗罗非鱼的低温耐受性都有所增加,当温度在8℃～11℃,盐度为12‰时,死亡率<50%,当温度低于8℃时,死亡率急剧升高,在7℃时全部死亡;经统计分析,盐度为12‰时的半数致死低温显著低于其他3组。以上结果说明,一定的盐度可提高罗非鱼的低温耐受性。
In order to improve the ability of cold resistance of Oreoebromis niloticus, in this experiment, we did some researches on low-temperature tolerance of Nile tilapia under 0‰, 5‰, 12‰, 25‰ four salinity gradients with indoor aquarium farming methods. The results showed that, as for temperature, the mortality rate showed a trend of increased and then decreased as the temperature decreases, When the temperature reached at 9.1℃, the mortality rate reached its maximum of 38.7%; in terms of salinity, salinity is 5‰ when mortality rate was the lowest, when the salinity increased to 25‰, means the highest mortality, according to Salinity, the survival time of 50% of individuals ranked as follows： 5‰ 〉 12‰ 〉0‰ 〉25‰ ; Under different salinity gradients, the low-temperature tolerance of Nile tilapia has increased, when the temperature reached at 8℃-11℃, salinity 12‰, the mortality rate did not reach half of the total, when the temperature was below 822, the death rate rised sharply, they all died at 7℃; with statistical analysis, half of the lethal low temperature at the salinity of 12‰ was significantly lower than the other three groups. These results suggested that a certain degree of salinity could increased the low-temperature tolerance of Oreoehromis nilotieus.
出处
《中国农学通报》
CSCD
2012年第35期82-86,共5页
Chinese Agricultural Science Bulletin
基金
国家"863""转座子介导的新吉富罗非鱼抗寒主效基因克隆与功能研究"(2007AA10Z164)
关键词
尼罗罗非鱼
盐度
低温耐受性
Oreochromis niloticus
salinity
low.temperature tolerance
