水生态学杂志2017，Vol.38Issue(4)：77-81,5.DOI:10.15928/j.1674-3075.2017.04.011
长薄鳅对过饱和总溶解气体的回避特征研究
Avoidance Characteristics of Leptobotia elongate to Total Dissolved Gas Supersaturation
摘要
Abstract
High-velocity flow in the process of high dam flood discharge leads to total dissolved gas supersaturation (TDGS) downstream of the dam, which can cause gas bubble disease in fish and can lead to acute mortality.Leptobotia elongate is an important economic fish species endemic to China, primarily inhabiting the upper Yangtze River and its tributaries.TDGS resulting from hydropower development on the upper Yangtze River threatens Leptobotia elongate populations.Leptobotia elongate spawns from April to June and juveniles, two to three months old, are especially vulnerable to TDGS.In this study, two-month-old Leptobotia elongate were used to explore avoidance characteristics to different degrees of supersaturation.Test fish, with an average weight of 1.0 g and average length of 2.5 cm, were acclimated for 15 d at 11-13℃ and dissolved oxygen of 5-7 mg/L, and fasted one day before testing.Four TDGS levels (120%, 130%, 140% and 150%) were set, with each treatment run in triplicate and 19-21 fish individuals per trial.Tests were conducted in low light and the position of the fish was recorded every 10 min to evaluate the perception and avoidance ability of Leptobotia elongate to TDGS water.Leptobotia elongate displayed a certain tropism at a TDGS of 120% and the rate of avoidance was-20%.Test fish did not display obvious avoidance at 130% supersaturation and the avoidance rate was-2%.Test fish showed weak avoidance and continually moved between saturated and supersaturated water at a TDGS of 140% and the avoidance rate was 12%.When the degree of TDGS was 150%, Leptobotia elongate were sensitive to supersaturated water and, after 1-2 m exposure, avoidance behavior was obvious, with an avoidance rate of 34%.There was a significant positive correlation between the avoidance rate of Leptobotia elongate and TDGS degree.These results provide a reference and basic data for the operation of hydropower stations and the establishment of water-related environmental standards in China.关键词
长薄鳅/回避率/探知能力/气体过饱和Key words
Leptobotia elongate/avoidance rate/perception ability/TDG supersaturation分类
生物科学引用本文复制引用
袁佺,袁嫄,王远铭,李永,李克锋..长薄鳅对过饱和总溶解气体的回避特征研究[J].水生态学杂志,2017,38(4):77-81,5.基金项目
国家自然科学基金(51379136) （51379136）
减水河道水量变化的鱼类饵料生物量响应关系研究(51479127) （51479127）
国家重点研发计划项目-水利工程环境安全保障及泄洪消能技术(课题十:泄水过饱和气体形成机制与消减技术研究)(2016YFC0401710). （课题十:泄水过饱和气体形成机制与消减技术研究）
