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为了考查温度对鳊(Parabramis pekinensis)幼鱼有氧运动能力的影响并探讨有关代谢机制,本研究分别在不同温度(10、18、26和34℃)下测定实验鱼的静止耗氧率(RMR)、临界游泳速度(Ucrit)和运动过程中的最大耗氧率(MMR),并以MMR和RMR的差值分别计算各温度下的能量代谢范围(MS)。结果表明:随着温度的上升,Ucrit呈现显著上升的趋势(P<0.05),温度由10℃升高至34℃,Ucrit由(6.01±0.32)升至(8.82±0.27)BL·s-1;RMR和MMR也随温度的升高呈现显著上升趋势(P<0.05),其测定值在温度由10℃升高至34℃时分别为(161.7±28.8)、(293.0±27.6)mgO2·kg-1·h-1和(558.6±20.4)、(1278.7±57.4)mgO2·kg-1·h-1,MMR在34℃与26℃相比有下降趋势;MS在10～26℃范围随温度的上升显著上升,26～34℃却出现显著下降(P<0.05)。可见:Ucrit和MS在高温条件下的反应不尽一致;这可能与水的粘滞系数下降、进而导致鳊能量效率提升有关,还可能由于实验鱼无氧代谢能力提高所致。
In order to investigate the effect of temperature on the aerobic capacity of juvenile Parabramis pekinensis and to explore its metabolic mechanism, the static oxygen consumption (RMR) of experimental fish at different temperatures (10, 18, 26 and 34 ℃) ), Critical swimming velocity (Ucrit) and maximal oxygen consumption rate (MMR) during exercise. The energy metabolism range (MS) at each temperature was calculated by the difference between MMR and RMR respectively. The results showed that the Ucrit increased significantly with increasing temperature (P <0.05), and the temperature increased from 10 ℃ to 34 ℃. The Ucrit increased from (6.01 ± 0.32) to (8.82 ± 0.27) BL · s-1 ; RMR and MMR also showed a significant upward trend with increasing temperature (P <0.05). The measured values were (161.7 ± 28.8), (293.0 ± 27.6) mgO2 · kg respectively when the temperature was increased from 10 ℃ to 34 ℃ -1 · h-1 and (558.6 ± 20.4) mg · kg-1 · h-1, respectively. MMR decreased at 34 ℃ compared with 26 ℃. MS ranged from 10 ℃ to 26 ℃ with temperature Increased significantly at 26 ~ 34 ℃ (P <0.05). It can be seen that the reaction between Ucrit and MS is not uniform at high temperature. This may be related to the decrease of water viscosity coefficient, which in turn leads to the increase of energy efficiency, and may also be due to the increase of anaerobic metabolism of experimental fish.