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首页> 外文期刊>North American Journal of Fisheries Management >Passage Route and Upstream Migration Success: A Case Study of Snake River Salmonids Ascending Lower Granite Dam
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Passage Route and Upstream Migration Success: A Case Study of Snake River Salmonids Ascending Lower Granite Dam

机译：通道路线和上游移民成功：以蛇河鲑鱼升降较低的花岗岩案例研究

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Lower Granite Dam is the last dam that federally protected Snake River salmonids Oncorhynchus spp. must ascend during their spawning migration. The dam has an adult fish ladder equipped with a trapping system to facilitate fisheries research and hatchery broodstock collection. There are three possible passage routes through the adult ladder: trapped, shunted, and free passage. During the adult trapping season, all fish must swim through 0.305-m shunt pipes outfitted with PIT tag arrays that allow the selection of fish for trapping. Selected fish use the "trapped" route and are kept in a holding area for up to 20 h before being sampled and returned to the ladder. Unselected fish use the "shunted" route and immediately resume upstream migration after swimming through the pipes. When the trap is not in operation, the shunted route is inaccessible, and all fish use the "free passage" route to ascend the ladder without additional impediment. In 2016, a temporary change in ladder operations permitted free passage for a portion of the trapping season. Our study used this rare opportunity to evaluate how different passage routes affect in-ladder transit time and upstream homing success for five salmonid stocks: Sockeye Salmon Oncorhynchus nerka; steelhead O. mykiss; and spring-, summer-, and fall-run Chinook Salmon O. tshawytscha. In 2016, only Sockeye Salmon and spring- and summer-run Chinook Salmon were given access to free passage, and we found evidence that free passage increased subsequent detection at natal sites upstream. An expanded analysis of shunted versus trapped fish during the years 2012-2016 found no difference in rates of detection to home tributaries by route of passage for any of the five fish stocks examined.
机译：较低的花岗岩大坝是联邦保护蛇河鲑鱼的最后一个大坝Oncorhynchus spp。必须在产卵迁移期间提升。大坝配有一个配备有诱捕系统的成人鱼梯，以促进渔业研究和孵化场托湾收集。通过成年梯子有三个可能的通道路线：被困，分流和自由段落。在成人捕获季节期间，所有鱼类必须通过坑标签阵列的0.305米的分流管游泳，允许选择鱼类以捕获。选定的鱼使用“被困”的路线，并且在采样之前保持在保持区域，高达20小时，并返回梯子。未选择的鱼类使用“被分流”的路线，并立即恢复通过管道游泳后的上游迁移。当陷阱不运行时，分流路线无法进入，所有鱼类都使用“自由通道”途径来提升梯子而无需额外的障碍。在2016年，梯子行动的临时变动允许一部分捕获季节的自由段落。我们的研究使用这种难得的机会来评估不同的通道路线如何影响阶梯式过境时间和上游归巢成功的五个鲑鱼股：红鲑鱼牛牛牛群岛书呆子; Steelhead O. Mykiss;和春天 - ，夏天和秋天的奇努克鲑鱼O. Tshawytscha。 2016年，只有SOCKEYE SALMON和SPRING-＆SUMPER-RUND CHINOOK SALMON获得免费通过，我们发现了自由通道在上游的当地网站上的后续检测。 2012 - 2016年期间，对分类的分流与被困鱼类的扩大分析发现，通过审查的任何五条鱼类股票，通过通道途径对家庭支流的检测率没有差异。

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