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Metabolic response under different salinity and temperature conditions for glass eel Anguilla japonica

机译：鳗鱼在不同盐度和温度条件下的代谢反应

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Diadromous fish often enter freshwater directly from seawater via fish ladders or channels built in estuarine dams. The oxygen consumption rates (OCR) of glass eel, Anguilla japonica, were determined using an automatic intermittent flow respirometer under various salinity and temperature regimes to physiologically explain this direct movement. The endogenous rhythm of the OCR in wild glass eels, freshly collected from estuaries, was nearly synchronous with the tidal pattern at the estuarine collection site. When the salinity was changed from 20 psu (12℃) at a constant temperature to that of freshwater, the OCR of the glass eels decreased by 21.6 ± 7.0% (mean ± SD) (P < 0.05), showing a dampened rhythm for about 48 h. After this period of impediment, the glass eels resumed normal metabolic activity. Direct migration from seawater to freshwater under constant temperature would result in a severe physiological stress for these glass eels for about two days. When the glass eels were exposed to a cyclic change in water temperature of 2℃ 26 h~(-1), as they encounter in estuaries, and then were introduced to freshwater abruptly, the OCR rhythm corresponded to the cyclic changes in water temperature after exposure to freshwater. Under these conditions, the mean OCR of the glass eels had a small difference before and after exposure to freshwater. These data explained how glass eels can directly move from sea water into the freshwater without any apparent meta- bolic stress in the estuaries showing cyclic change in water temperature (Δt=2℃).
机译：渗水鱼类通常通过鱼梯或在河口大坝中建造的渠道直接从海水进入淡水。使用自动间歇流动呼吸仪在各种盐度和温度范围内测定玻璃鳗（日本鳗鱼）的耗氧率（OCR），从生理上解释这种直接运动。从河口新鲜采集的野生玻璃鳗中OCR的内源性节律与河口采集点的潮汐模式几乎同步。当盐度在恒定温度下从20 psu（12℃）变为淡水时，玻璃鳗的OCR降低了21.6±7.0％（平均值±SD）（P <0.05），显示了大约一个节律的衰减。 48小时在这段时期之后，玻璃鳗恢复了正常的代谢活动。在恒温条件下，海水从海水直接迁移到淡水将对这些玻璃鳗造成严重的生理压力，持续约两天。当玻璃鳗在河口遇到2℃26 h〜（-1）的水温循环变化，然后突然引入淡水时，OCR节律对应于水体在循环后的温度变化。接触淡水。在这些条件下，玻璃鳗的平均OCR在暴露于淡水之前和之后都有很小的差异。这些数据说明了玻璃鳗如何直接从海水移入​​淡水而在河口中没有任何明显的代谢应力，表明水温呈周期性变化（Δt= 2℃）。

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