温度和体质量对胭脂鱼鱼种耗氧率的影响

摘要

The effects of temperature on oxygen consumption rate of Myxocyprinus asiaticus were tested in a closed flowing experimental system and the temperatures were ranged from 18℃ to 30℃.The results shows that the oxygen consumption rate of Myxocyprinus asiaticus increased as water temperatures increased in a certain limits. And the functional relation between the Oxygen consumption rate and temperature was y = - 0.000 8 x2+ 0.044 0 x - 0.438 1, R2= 0.990 6. The average oxygen consumption rate between day-time and night-time were (0.204 2 ± 0.011 0 ) mg.g-1.h-1and (0.205 7 ± 0.012 2 )mg.g-1.h-1, respectively at 27℃,and there was no significant difference with analysis of variance(P > 0.05). In addition, the oxygen consumption rate of Myxocyprinus asiaticus shows a declining curve as the body size increased under different test temperature.%采用流水式的密封装置测定了胭脂鱼鱼种在18～30℃温度范围内的耗氧率，结果表明，在实验温度范围内，胭脂鱼鱼种耗氧率随温度上升逐渐升高，符合函数关系：y=-0.0008 x2+0.0440 x-0.4381, R2=0.9906。胭脂鱼鱼种耗氧率昼夜变化测定实验表明，其昼均耗氧率（0.2042±0.0110）mg∙g-1∙h-1，略低于夜均耗氧率（0.2057±0.0122）mg∙g-1∙h-1，二者差异不具统计学意义（P>0.05），表明胭脂鱼鱼种耗氧率并不存在明显的昼夜节律。在不同实验温度下，随着胭脂鱼鱼种规格的增大，其耗氧率均呈下降趋势。