The Snake River, Idaho, between Swan Falls and Brownlee dams supports a popular fishery for Smallmouth Bass Micropterus dolomieu. Recently, anglers have expressed concern about harvest of Smallmouth Bass associated with seasonal congregations in and near the lower reaches of several major tributaries. Little is known about Smallmouth Bass movement in the system, and a better understanding of movement dynamics will help to guide future management. From March to August 2016, Smallmouth Bass (≥260 mm; n = 1,131) were tagged with T‐bar anchor tags to evaluate large‐scale movement patterns. Movement was estimated from 63 angler‐reported tags for which area descriptions provided sufficient detail to assign a recapture location. Extent of fish movement varied among segments and tributaries from 0 to 128 river kilometers (rkm). From March to May 2017, Smallmouth Bass (≥305 mm; n = 149) in the Snake, Boise, Payette, and Weiser rivers and in Brownlee Reservoir were implanted with radio transmitters. Of the 149 Smallmouth Bass that were released with radio transmitters, 107 were relocated at least once. Additionally, 79.6% of fish with radio transmitters had a maximum extent of movement of 5 rkm or greater and 42.6% had a maximum extent of 30 rkm or greater; one radio‐tagged fish moved 167 rkm upstream. Average daily movement of Smallmouth Bass varied among river segments and was greatest in the spring and summer. Fish from the Snake River, tributaries (e.g., Boise River), and Brownlee Reservoir moved all around the study area, indicating an absence of clear population boundaries. As such, Smallmouth Bass in the study area appear to function as one large population as opposed to multiple subpopulations, thereby indicating that management as one population is likely appropriate.

中文翻译：

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西部大河系中小口鲈的运动动力学

天鹅瀑布和布朗利水坝之间的爱达荷州蛇河为小嘴鲈Micropterus dolomieu的流行渔业提供了支持。最近，垂钓者对与几个主要支流及其下游附近的季节性会聚有关的小口黑鲈的收获表示关注。对系统中的Smallmouth Bass机芯知之甚少，对机芯动力学的更好理解将有助于指导未来的管理。从2016年3月到2016年8月，Smallmouth Bass（≥260mm; n  = 1,131个）用T型锚标签标记，以评估大规模的运动模式。根据63个钓鱼者报告的标签估计了移动，这些标签的区域说明提供了足够的详细信息以分配重新捕获的位置。鱼类活动的程度在各段和支流之间变化，范围从0到128公里（rkm）。从2017年3月至5月，Smallmouth低音（≥305毫米；n  = 149）在Snake，Boise，Payette和Weiser河流以及Brownlee水库中植入了无线电发射机。在用无线电发射器释放的149个Smallmouth Bass中，有107个至少被重新安置了一次。此外，使用无线电发射器的鱼类的最大运动幅度为5 rkm或更大，达到79.6％，最大运动幅度为30 rkm或更高，达到42.6％。一条带有无线电标签的鱼向上游移动167千米。在河段之间，小嘴鲈鱼的平均每日运动量有所不同，在春季和夏季最大。来自斯内克河，支流（例如博伊西河）和布朗利水库的鱼类在整个研究区域内移动，表明没有明确的种群边界。因此，研究区域的Smallmouth Bass似乎是一大人口，而不是多个亚种群，