鳗鱼道堰面加糙的过鱼效果评价

为保护我国鳗鲡资源，解决低水头水工建筑物对幼鳗洄游上溯的阻隔效应，以2017年6—8月试验资料为基础，对堰面加糙鳗鱼道的过鱼效率、鳗鲡行为轨迹和游泳速度等进行评价。结果表明:试验组(下游堰面镶嵌加糙块)和对照组(下游堰面不做处理)的过鱼效果差异明显，上溯成功率分别为82.5%±2.5%和13%±4.79%。与对照组相比，试验组幼鳗在上溯过程中较为活跃，其上溯形式与蛇类爬行相似，呈现S形、Z形和直线形且边缘趋向运动较为明显，是一种典型的爆发游泳登上堰顶的行为，单次最大爆发游泳速度高达0.66 m/s。

Study on elver passing efficiency for weir surface roughing of eel channel

In order to protect elver resources in China and to solve the obstruction effect of low-head water-power engineering in the back migration of elvers, based on the indoor monitoring data from June to August, 2017, the passing efficiency of fishway, trajectory of behavior and swimming speed were evaluated by statistical analysis for the eel channel with weir surface roughing. This study shows that the passing efficiency was significantly different between the experimental group(with rough on the downstream face)and the control group(without rough on the downstream face), the migration success rates of which were 82. 5% ± 2. 5% and 13% ± 4. 79%, respectively. Compared to the control group, the elvers of the experimental group were more active in the process of back migration and its form was like the snake crawling, which showed S, Z and straight type. Besides, the edge-oriented movement was more obvious, and was a typical kind of behavior of climbing to the top of a weir though a typical burst swimming events, the maximum explosive speed of which reaches up to 0. 66 m/s.