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Flow preferences of upstream migrating Atlantic salmon (Salmo salar)

机译：上游迁移大西洋鲑（Salmo撒拉族）的水流偏好

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On their way from the sea to their spawning grounds in rivers, Atlantic salmon are often delayed or hindered by dams or other obstructions. Building a fishway can save a population that would otherwise go extinct. But even when there is a fishway present, sometimes the fish will have difficulties finding the entrance or navigating through the fishway. Understanding fish preferences during their upstream migration can help us improve fishway design so we can help the fish move upstream.ududThe main goal of my studies was to find hydrodynamic preferences of salmon. We were able to show a preference for high turbulence intensity (I ~ 0.7). We also found a preference for lower water velocity. In my last study, I found most salmon near the highest available water velocity, which in light of previous results was interpreted as the salmon seeking out the turbulent areas in the boundary layer of the high velocity jet in the center of the river.ududThere were several indications that Atlantic salmon prefer to save energy, and that they are able to utilize turbulent structures to save energy during their active migration. However, much of the proof was circumstantial and requires further investigation. As a main source of error, the instruments used to measure hydrodynamics were not precise enough. More focus should be put on developing better instruments, for example the newly invented artificial lateral lines.
机译：从海到河流产卵场的途中，大西洋鲑鱼经常被水坝或其他障碍物拖延或阻碍。建立一条鱼道可以拯救原本会灭绝的人口。但是，即使有一条鱼道，有时鱼也很难找到入口或在鱼道中航行。了解上游鱼类迁移过程中的鱼类偏好可以帮助我们改善鱼道设计，从而帮助鱼类向上游移动。 ud ud我研究的主要目标是寻找鲑鱼的水动力偏好。我们能够显示出对高湍流强度的偏好（I〜0.7）。我们还发现了对较低水速的偏爱。在我的上一份研究中，我发现大多数鲑鱼都接近最高可用水速，根据先前的研究结果，这被解释为鲑鱼在河中心寻找高速射流边界层中的湍流区域。 ud有几种迹象表明，大西洋鲑鱼更喜欢节能，在活跃的迁徙过程中，它们能够利用湍流结构来节约能源。但是，很多证据都是间接的，需要进一步调查。作为误差的主要来源，用于测量流体动力学的仪器不够精确。应该将更多的精力放在开发更好的仪器上，例如新发明的人工侧线。

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    Lindberg Dan-Erik;

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