| 摘要: |
| 以1月龄棘胸蛙蝌蚪（体长1.694±0.121cm，体质量0.548±0.062g）为研究对象，在静水停饲条件下，设置19℃、21.5℃、23℃、24.5℃和26℃等5个实验水温梯度，较系统开展了水温对其呼吸与排泄的影响研究。结果表明：（1）23℃为棘胸蛙蝌蚪表露正常耗氧的最适高温，24.5℃为其耗氧昼夜节律尚未发生根本性改变的高温临界；（2）棘胸蛙蝌蚪的日均Q10值对其响应水温变动具指示作用。其中，Q10值呈夜均>昼均（P<0.05），且昼均、夜均和日均Q10值均为峰值的水温范围仅为21.5-23℃；（3）所涉各实验组的排氨昼夜节律均呈夜均>昼均（P<0.05），且日均排氨率均与其夜均、昼均排氨率无显著差异（P>0.05）。其中，致其时段排氨率表露异常的实验水温仅为24.5℃；（4）O︰N值大小及其昼夜变动特征均与其所处水温有着极为密切的关系，其中夜均、昼均和日均O︰N值均以24.5℃实验组为最大，夜均、日均O︰N值均以26℃实验组为最小，而O︰N值呈夜均 >日均 >昼均（P<0.05）的实验水温则仅为23℃；（5）窒息点含氧量大体上有随水温升高呈显著增大的趋势，其中21.5-23℃为其窒息点含氧量保持相对稳定的温度范围。 |
| 关键词: 水温 棘胸蛙蝌蚪 耗氧率 热能效系数(Q10) 排氨率 氧氮比 窒息点 |
| DOI：10.11693/hyhz20160700146 |
| 分类号: |
| 基金项目:余姚市与浙江海洋学院市院合作项目：棘胸蛙集约化高效养殖关键技术集成与综合示范（2013-2016）。 |
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| EFFECTS OF WATER TEMPERATURE ON RESPIRATION AND EXCRETION OF PAA SPINOSA TADPOLES |
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YANG Cheng1, LIU Zhe-Yu1, ZHU Wei-Dong1,2, ZOU Li-Chang3, WANG Zhi-Zheng1
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1.Zhejiang Ocean University, Zhoushan 316022, China;2.Fishery Technology Extension Center of Yuyao, Yuyao 315400, China;3.Forestry and Water Conservancy Bureau of Ningbo Jiangbei, Ningbo 315020, China
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| Abstract: |
| One-month old Paa spinosa tadpoles with a length of 1.694±0.121cm and body weight of 0.548±0.062g were selected for the research.Five water temperature gradients (19℃,21.5℃,23℃,24.5℃ and 26℃) were set to study effects of water temperature on their respiration and excretion.The experiment was conducted in static water without feeding.The results showed that:(1) The optimal megatemperature that P.spinosa tadpoles revealed normal oxygen consumption was 23℃.The megatemperature threshold that oxygen consumption circadian rhythms showed no fundamental change was 24.5℃;(2) The average Q10 value in the whole day of P.spinosa tadpoles was an indicator for their response to the water temperature.Moreover,the average Q10 value in the night was higher than that in the day (P<0.05),and the water temperature range at which the average Q10 value in the day or night and whole day were at the peak was from 21.5℃ to 23℃.(3) Ammonia excretion circadian rhythms in every involved experimental groups showed that average ammonia excretion in the night were higher when compared with the day (P<0.05).However,the average value in the whole day had no significant difference with that in the night or the day (P>0.05).Only in the experimental group that water temperature was 24.5℃ that abnormal ammonia excretion rate occurred.(4) Both of the O︰N value and the characteristic of its diurnal variation have a close relationship with the surrounding water temperature.The highest average value of O︰N in the night or the day and the whole day all occurred in the experimental group with a water temperature of 24.5℃.The lowest average value in the night and the whole day both occurred at 26℃.Only at the temperature of 23℃ that average O︰N value in the night,the whole day and the day increased in turn (P<0.05).(5) The oxygen content in the suffocation point tend to increase significantly with the increase of the surrounding water temperature in the general.Besides,the oxygen content in the suffocation point kept relatively stable when the water temperature ranged from 21.5 to 23℃. |
| Key words: water temperature Paa spinosa tadpoles oxygen consumption coefficient of thermal efficiency (Q10) ammonia excretion oxygen-nitrogen ratio (O︰N) suffocation point |
