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The influence of total dissolved gas supersaturated water to Silver carp

机译：总溶解气体过饱和水对银鲤鱼的影响

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The upper Yangtze River is the center area of hydropower engineering and also the habitat of many economic fishes, but after numbers of high-dams being or to be put into operation, the influence of dams to fishery attracts many attentions. During sluicing, high-speed flow with a large number of gas dissolved will generate total dissolved gas (TDG) supersaturated water in the downstream of the dam, which will affect the survival of fishes and even damage their lives. Silver carp is wildly distributed in the upper Yangtze River. This paper focuses on the influence of TDG supersaturation (TDGS) to silver carp by the acute-lethal experiment and the catalase (CAT) activity test. In the acute-lethal experiment, Silver carp were exposed to TDG saturation levels of 140%, 135%, 130%, 125%, 120%, 110% and 100% for 72 hours, Silver carps in the high TDG saturation levels were all died in a short time but no silver carp died in the low TDG saturation levels. In order to intensive study the tolerance of silver carp to TDGS, the CAT activity test was designed to analysis the activity of CAT in gills and muscle of Silver carp for the activity of CAT can reflect the toxic effects by TDGS. The result demonstrated that at the beginning of exposing to the TDG supersaturated water, CAT activity in silver carp was very low and then changed very high, but with the exposure time went on, the activity was returned to normal. CAT activities in gills were much higher than that in muscle. The research on the influence of TDGS to fishes can quantitatively evaluated the suitable living conditions of silver carp and provided basic date for developing the standard of environment evolution.
机译：上长江上部是水电工程中心地区，也是许多经济鱼类的栖息地，但经过数量的高水坝存在或投入运作，大坝对渔业的影响吸引了许多关注。在熔化过程中，具有大量气体溶解的高速流动将在坝的下游产生总溶解气（TDG）过饱和水，这将影响鱼类的存活率，甚至损害他们的生活。银色鲤鱼在上长江野外分布。本文侧重于急性致命实验和过氧化氢酶（猫）活性试验对TDG过饱和度（TDGS）对银鲤来的影响。在急性致命的实验中，银鲤鱼暴露于TDG饱和水平140％，135％，130％，125％，120％，110％和100％，在72小时内，在高TDG饱和度水平中的银鲤是全部在短时间内死亡，但在低TDG饱和度水平中没有白银鲤鱼死亡。为了密集研究银鲤来到TDG的耐受性，猫活动试验旨在分析猫的活性，银鲤掌的猫类活动对于猫的活动可以反映TDGS的毒性效应。结果证明，在暴露于TDG过饱和水的开始时，银鲤鱼中的猫活性非常低，然后变化非常高，但随着曝光时间继续，活动恢复正常。鳃的猫活动远远高于肌肉的活动。对TDGS对鱼类的影响的研究可以定量评估银鲤的合适生活条件，并提供了开发环境演化标准的基本日期。

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