When dealing with invasive fishes, permanent barriers may inhibit spread, but may not be feasible due to costs and logistical constraints. Alternatively, non-permanent barriers using electricity, light, sound, pressure, bubbles, and CO2 are being developed and deployed in efforts to limit and prevent the spread of aquatic invasive species or to achieve fish guidance and conservation. However, the effectiveness of these barriers is quite variable and testing is often lacking for both invasive and native species. We conducted a laboratory experiment to investigate the impact of vertical electric barrier on behaviour of Rainbow Trout, Oncorhynchus mykiss. In response to electric current, Rainbow Trout responded by significantly decreasing passage through the electric barrier zone and spending more time away from the electric barrier when it was turned on during the stimulus period compared to pre-stimulus period. Moreover, when interacting with electric barrier, Rainbow Trout exhibited certain behaviours (e.g. stunned and remained on the same side of the barrier, stunned and crossed the barrier) more than others (e.g. approach and retreat, deflected, and paralyzed). Moreover, it appears that Rainbow Trout remained distant from the electric barrier even after the electric barrier was turned off. Our results indicate that relatively weak electric gradient (i.e. voltage gradient: 0.2 – 0.4 v·cm−1, power density: 3 – 42 µW·cm−3) can inhibit the movement of Rainbow Trout. Our results also highlight the importance of detailed investigation of behavioural responses of target species when evaluating and considering fish-deterrent or guidance technologies.

中文翻译：

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垂直电屏障对虹鳟鱼行为的影响

在处理入侵鱼类时，永久性屏障可能会抑制传播，但由于成本和物流限制，可能不可行。或者，正在开发和部署使用电、光、声、压力、气泡和二氧化碳的非永久性屏障，以努力限制和防止水生入侵物种的传播或实现鱼类引导和保护。然而，这些屏障的有效性差异很大，并且通常缺乏对入侵物种和本地物种的测试。我们进行了一项实验室实验，以研究垂直电势垒对虹鳟鱼 Oncorhynchus mykiss 行为的影响。响应电流，与刺激前相比，虹鳟鱼的反应是在刺激期间显着减少通过电屏障区的通道并花费更多时间远离电屏障。此外，在与电障互动时，虹鳟鱼表现出的某些行为（例如，昏迷并保持在障碍的同一侧，昏迷并越过障碍）比其他行为（例如接近和撤退，偏转和瘫痪）更多。而且，即使在电闸关闭后，虹鳟鱼似乎仍然远离电闸。我们的结果表明，相对较弱的电梯度（即电压梯度：0.2 – 0.4 v·cm-1，功率密度：3 – 42 µW·cm-3）可以抑制虹鳟鱼的运动。