论文部分内容阅读
为了研究瓦氏黄颡鱼(Peltebagrus vachelli)在不同溶氧水平(DO)下的游泳运动能力、限制性机制及能量适应对策,在25℃分别对不同溶氧水平(125%、100%、75%、50%和25%空气饱和度)条件下瓦氏黄颡鱼幼鱼静止耗氧率、临界游泳速度(Ucrit)、活跃耗氧率进行了测定。研究发现瓦氏黄颡鱼的静止耗氧率随溶氧水平下降而显著下降(P<0.05),其临界氧浓度点([O2]crit)为14.52%空气饱和度(1.16 mg/L)。当溶氧水平从100%下降到25%空气饱和度时,其活跃耗氧率随溶氧的下降而显著下降(P<0.05);当溶氧从75%下降到25%空气饱和度时,其临界游泳速度随溶氧的下降而显著下降(P<0.05);但是在超饱和氧(125%空气饱和度)条件下,其临界游泳速度与活跃耗氧率均没有显著提升;在25%空气饱和度条件下的游泳转化效率显著低于其余溶氧组条件下的游泳转化效率(P<0.05)。研究结果提示:在低氧条件下,瓦氏黄颡鱼的临界游泳速度受中心的心鳃系统的限制,而在常氧条件下,受外周的运动系统(肌肉组织)的限制。
In order to study the swimming ability, restriction mechanism and energy adaptation strategy of Peltebagrus vachelli at different dissolved oxygen levels (DO), different dissolved oxygen levels (125%, 100%, 75 %, 50% and 25% air saturation), the static oxygen consumption rate, critical swimming velocity (Ucrit) and active oxygen consumption rate of Juvenile Val. The study found that the static Oxygen Consumption rate decreased sharply with the decrease of dissolved oxygen level (P <0.05) and the critical oxygen concentration point ([O2] crit) was 14.52% air saturation (1.16 mg / L). When dissolved oxygen level decreased from 100% to 25% air saturation, the active oxygen consumption rate decreased significantly with the decrease of dissolved oxygen (P <0.05). When dissolved oxygen decreased from 75% to 25% air saturation, The critical swimming speed decreased significantly with the decrease of dissolved oxygen (P <0.05). However, the critical swimming speed and active oxygen consumption rate did not increase significantly under the condition of supersaturated oxygen (125% air saturation) The swimming conversion efficiency under air saturation was significantly lower than that of the other DO groups (P <0.05). The results suggest that under hypoxic conditions, the critical swimming speed of M. carpio is limited by the central gill system, while under normoxic conditions, it is limited by the peripheral motor system (muscle tissue).