To acquire 3-D tracking data on juvenile salmonids, Juvenile Salmon Acoustic Telemetry System (JSATS) cabled hydrophone arrays were deployed in the forebays of two dams on the Snake River and at a mid-reach reservoir between the dams. The depth distributions of fish were estimated by statistical analyses performed on large 3-D tracking data sets from ~33,500 individual acoustic tagged yearling and subyearling Chinook salmon and juvenile steelhead at the two dams in 2012 and subyearling Chinook salmon at the two dams and the mid-reach reservoir in 2013. This research investigated the correlation between vertical migration behavior and passage routes. The depth distributions of fish within the forebays of the dams were significantly different from fish passing the mid-reach reservoir. Fish residing deeper in the forebay tended to pass the dam using deeper powerhouse routes. This difference in depth distributions indicated that the depth distribution of fish at the mid-reach reservoir was not related to behaviors of fish passing through certain routes of the adjacent dams. For fish that were detected deeper than 17.5 m in the forebays, the probability of powerhouse passage (i.e., turbine) increased significantly. Another important finding was the variation in depth distributions during dam passage associated with the diel period, especially the crepuscular periods.

中文翻译：

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幼鲑鱼在水库和大坝附近的三维迁移行为。

为了获取有关少年鲑鱼的3-D跟踪数据，将少年鲑鱼声遥测系统（JSATS）有线水听器阵列部署在Snake河上两个大坝的前湾以及大坝之间的中游水库中。通过对大型3D跟踪数据集进行统计分析，估计了鱼的深度分布，这些数据集来自于2012年两个大坝的约33,500个个体声学标记的一岁和亚岁的契努克鲑鱼和幼年硬头鱼，以及两个大坝和中游的亚岁的奇努克鲑鱼。于2013年到达水库。这项研究调查了垂直运移行为与通道路径之间的相关性。大坝前湾中鱼类的深度分布与通过中游水库的鱼类的深度差异显着。居住在前湾深处的鱼类倾向于使用更深的动力路线通过大坝。这种深度分布的差异表明，中游水库中鱼的深度分布与通过相邻水坝某些路径的鱼的行为无关。对于在前湾中被检测到深于17.5 m的鱼类，动力通过（即涡轮机）通过的可能性显着增加。另一个重要发现是与diel期（尤其是黄昏期）相关的大坝通过期间深度分布的变化。对于在前湾中被检测到深于17.5 m的鱼类，动力通过（即涡轮机）通过的可能性显着增加。另一个重要发现是与diel期（尤其是黄昏期）相关的大坝通过期间深度分布的变化。对于在前湾中被检测到深于17.5 m的鱼类，动力通过（即涡轮机）通过的可能性显着增加。另一个重要发现是与diel期（尤其是黄昏期）相关的大坝通过期间深度分布的变化。