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废水可以作为迁徙银的非物理障碍

Hendrik Volken Winter¹, Olvin Alior van Keeken¹, Frank Kleissen²

¹Wageningen Marine Research, IJmuiden, The Netherlands.

|June 27, 2023

概括

污水处理厂的羽毛充当非物理障碍,导致鱼类避免迁移. 大多数鱼最终都通过了,但出现了延误,突出了需要更好的排放点设计的需要.

科学领域:

水生生态学水生生态学
鱼类的迁徙鱼类的迁徙
环境科学环境科学

背景情况:

非物理障碍,如废水处理厂 (WWTP) 的废水,未得到充分研究.
这些羽毛可能会显著影响鱼类的行为和迁徙的成功.

研究的目的:

为了研究迁徙的银对WWTP废水的行为反应.
评估这些羽毛可能作为迁移障碍物的潜力.

主要方法:

在下游迁徙期间,现场监测40只声学标记的银 (Anguilla anguilla).
利用2D和3D遥测来跟踪鱼相对于模拟的WWTP羽毛的运动.

主要成果:

59%的鱼在遇到WWTP羽毛时表现出回避行为.
86%的避免鱼最终通过了研究区域,延迟时间从几个小时到几天.
没有观察到对羽毛的吸引力.

结论:

在WWTP上,水柱可能会导致大量的避开和延迟银迁徙.
可变的羽毛散布创造了临时通道窗口,防止了完全的阻塞.
排放点的优化设计对于最小化对鱼类迁徙路线的影响至关重要.

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