总溶解气体过饱和对长薄鳅的急性和慢性致死效应研究

发布时间：2018-10-25 10:14

【摘要】：高坝在泄流过程中可携带大量空气进入水体,形成总溶解气体(total dissolved gas,简称TDG)过饱和,给下游水生生物尤其是鱼类的生存造成威胁。本文以长江流域特有珍稀鱼种——长薄鳅为研究对象,对其进行不同TDG饱和度下致死试验和再暴露试验,旨在研究长薄鳅对TDG过饱和水体的耐受性及低饱和度对其的慢性伤害作用。结果表明长薄鳅连续暴露在TDG饱和度为120%、130%和140%水体中的半致死时间分别为152.81、64.02和14.89 h。将在110%和120%饱和度下暴露96 h后存活的长薄鳅,再次放入到140%浓度下进行暴露,该情况下两组的半致死时间为8.72和7.14 h,较原140%工况下正常试验鱼半致死时间分别快41.4%和52.05%;将在110%和120%饱和度下暴露96 h后存活的长薄鳅,再次放入130%浓度下进行暴露,该情况下两组的半致死时间为47.77和15.52 h,较原130%工况下正常试验鱼半致死时间快25.56%、75.81%。结果表明TDG低饱和度水体对长薄鳅有慢性伤害的影响。
[Abstract]:During the discharge process, the high dam can bring a large amount of air into the water body and form the total dissolved gas (total dissolved gas, (TDG) supersaturation, which threatens the survival of the downstream aquatic organisms, especially the fish. In this paper, a rare and rare species of Loach in the Yangtze River Basin was studied by lethal test and re-exposure test under different TDG saturation. The purpose of this study was to study the tolerance of Loach to TDG supersaturated water and the chronic injury effect of low saturation. The results showed that the half-lethal time of continuous exposure to 120% and 140% TDG saturation of Loach was 152.81 ~ 64.02 and 14.89 h, respectively. The long and thin Loach which survived 96 hours after exposed to 110% and 120% saturation was again exposed to 140% concentration. The half-lethal time of the two groups was 8.72 and 7.14 h, which was 41.4% and 52.05 faster than that of the normal fish under 140% operating conditions, and the long and thin Loach which survived 96 hours after exposed to 110% and 120% saturation was again exposed to 130% concentration. The half-lethal time of the two groups was 47.77 and 15.52 h, which was 25.56 ~ 75.81 hours faster than that of the normal fish under 130% working condition. The results showed that the low saturation water of TDG affected the chronic injury of Loach.
【作者单位】：四川大学水力学与山区河流开发保护国家重点实验室;
【基金】：国家自然科学基金资助项目(51379136) 国家重点研发计划资助项目(2016YFC0401710)
【分类号】：S917.4;TV131.3

【相似文献】