Laboratory of Evolutionary Physiology and Behaviour, Chongqing Key Laboratory of Animal Biology, Chongqing Normal University, Chongqing, 400047, China.
Comp Biochem Physiol A Mol Integr Physiol. 2010 Feb;155(2):253-8. doi: 10.1016/j.cbpa.2009.11.005. Epub 2009 Nov 12.
To test whether the effects of feeding on swimming performance vary with acclimation temperature in juvenile southern catfish (Silurus meridionalis), we investigated the specific dynamic action (SDA) and swimming performance of fasting and feeding fish at acclimation temperatures of 15, 21, 27, and 33 degrees C. Feeding had no effect on the critical swimming speeding (U(crit)) of fish acclimated at 15 degrees C (p=0.66), whereas it elicited a 12.04, 18.70, and 20.98% decrease in U(crit) for fish acclimated at 21, 27 and 33 degrees C, respectively (p<0.05). Both the maximal postprandial oxygen consumption rate (VO2peak) and the active metabolic rate (VO2active, maximal aerobic sustainable metabolic rate of fasting fish) increased significantly with temperature (p<0.05). The postprandial maximum oxygen consumption rates during swimming (VO2max) were higher than the VO2active of fasting fish at all temperature groups (p<0.05). The VO2max increased with increasing temperature, but the relative residual metabolic scope (VO2max-VO2peak) during swimming decreased with increasing in temperature. The present study showed that the impairment of postprandial swimming performance increased with increasing temperature due to the unparalleled changes in the catfish's central cardio-respiratory, peripheral digestive and locomotory capacities. The different metabolic strategies of juvenile southern catfish at different temperatures may relate to changes in oxygen demand, imbalances in ion fluxes and dissolved oxygen levels with changes in temperature.
为了测试在幼体南方鲶（Silurus meridionalis）中，摄食对游泳性能的影响是否随驯化温度而变化，我们在驯化温度为 15、21、27 和 33°C 的情况下，研究了禁食和摄食鱼类的比静息代谢率（SDA）和游泳性能。摄食对驯化温度为 15°C 的鱼类的临界游泳速度（U(crit)）没有影响（p=0.66），而对驯化温度为 21、27 和 33°C 的鱼类的 U(crit)分别产生了 12.04%、18.70%和 20.98%的降低（p<0.05）。摄食后最大耗氧量（VO2peak）和活跃代谢率（VO2active，禁食鱼类的最大有氧可持续代谢率）均随温度显著增加（p<0.05）。游泳时的摄食后最大耗氧量（VO2max）在所有温度组中均高于禁食鱼类的 VO2active（p<0.05）。VO2max 随温度升高而升高，但游泳时相对剩余代谢范围（VO2max-VO2peak）随温度升高而降低。本研究表明，由于鲶鱼的中心心肺、外周消化和运动能力的无与伦比的变化，摄食后游泳性能的损害随温度升高而增加。幼体南方鲶在不同温度下的不同代谢策略可能与氧气需求的变化、离子通量和溶解氧水平的失衡随温度的变化有关。
