Effect of Acute Low Temperature Stress on Oxygen Consumption Rate and Respiration Frequency in Silurus meridionalis and Pelteobag vachelli

The objective of the study was to explore the effect of acute low temperature stress on VO2 and Vf of Silurus meridionalis and Pelteobag vachelli after 10 minutes cold water bath with different temperature.The investigation was operated under the temperature of 24 ℃.It was found that the VO2 and Vf of Silurus meridionalis after 6 and 0 ℃ stress showed a decrease-increase-decrease trend while other groups showed a rapid increase then slowly recovery trend.The VO2 and Vf of Pelteobag vachelli after 0 ℃stress showed a decrease-increase-decrease trend while other groups showed an increase then slowly recovery process.It was suggested that Pelteobag vachelli was more adaptive to acute cold stress,but it cost more energy adapting to cold stress compared to Silurus meridionalis.

追赶和空气曝露时间对瓦氏黄颡鱼耗氧率的影响

在20℃水温条件下,对不同时间追赶(0、0.5、2.5和5min)和空气曝露(0、2.5、5、10和20min)前和恢复过程中瓦氏黄颡鱼(Pelteobag vachelli)的耗氧率进行了测定。发现经过追赶和空气曝露处理后,瓦氏黄颡鱼耗氧率立即显著上升(P<0.05),然后逐渐恢复到处理前水平。瓦氏黄颡鱼对追赶的反应远大于空气曝露。仅仅0.5min的追赶就能够诱导出瓦氏黄颡鱼的最大耗氧率(146.66mgO2/h),2.5min追赶能诱导最大过量耗氧(39.01mgO2);5min空气曝露处理能诱导最大耗氧率(113.52mgO2/h),10min处理能诱导最大过量耗氧(23.01mgO2)。

急性低温胁迫对南方鲇和瓦氏黄颡鱼耗氧率和呼吸频率的影响

[目的]为了研究急性低温胁迫对南方鲇和瓦氏黄颡鱼耗氧率和呼吸频率的影响。[方法]于24℃条件下测定南方鲇和瓦氏黄颡鱼经过不同温度(24、18、12、6、0℃)10 min低温胁迫后耗氧率(VO2)和呼吸频率(Vf)的恢复过程。[结果]结果表明:南方鲇在6、0℃胁迫后VO2和Vf表现为先下降、后上升然后缓慢回落的过程,其余组表现为先迅速上升然后缓慢回落的过程;瓦氏黄颡鱼只有0℃表现为先下降、后上升然后缓慢回落的过程,其余组表现为先迅速上升然后缓慢回落的过程。[结论]瓦氏黄颡鱼对急性低温胁迫抵抗力更高,但同样的低温胁迫瓦氏黄颡鱼需要消耗更多的能量。该研究为生产实践提供了基础数据。