Stream habitat fragmentation caused by manmade structures is ubiquitous in Colorado, creating a need for passage solutions that accommodate multiple fish species. This study tested the effectiveness of a rock‐ramp fishway for passing nine fish species with a range of swimming abilities. The target species for the fishway design included Brassy Minnow Hybognathus hankinsoni (weakest swimming), Longnose Dace Rhinichthys cataractae, Longnose Sucker Catostomus catostomus, and Brown Trout Salmo trutta (strongest swimming). Testing included a 46‐h enclosure study and 3‐month extended study, during which fish passage was evaluated using PIT tags. All of the species exhibited successful passage through the fishway during the enclosure study, but movement probabilities varied by species. Five species were not detected at the fishway during the extended study, possibly due to issues with attraction flows, entrance conditions, or motivation. Hydraulic conditions within the fishway were also evaluated. Roughness elements maintained a benthic, low‐velocity zone across a range of flows, even when surface and depth‐averaged velocities surpassed the design criteria for the weakest swimming species. The methods from this study could be replicated at other locations to evaluate design criteria (e.g., slope, capacity, roughness, and configuration) and performance for a variety of fish species and fishway types.

中文翻译：

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科罗拉多过渡区溪流岩道上的多物种鱼道评估

由人造结构引起的河流栖息地破碎化在科罗拉多州无处不在，因此需要容纳多种鱼类的通道解决方案。这项研究测试了一条岩坡鱼道对传递具有多种游泳能力的九种鱼类的有效性。鱼类设计的目标物种包括Brassy Minnow Hybognathus hankinsoni（最弱的游泳），Longnose Dace Rhinichthys白内障，Longnose Sucker Catostomus catostomus和棕鳟Salmo trutta（最强的游泳）。测试包括一项为期46小时的围栏研究和为期3个月的扩展研究，在此期间，使用PIT标签评估了鱼的通过。在围封研究期间，所有物种均显示成功通过了鱼道，但移动概率因物种而异。在扩展研究期间，未在鱼道上发现五个物种，这可能是由于吸引流量，进入条件或动力问题所致。还评估了鱼道内的水力状况。即使表面和深度的平均速度超过了最弱游泳物种的设计标准，粗糙度元素仍可在一定范围的水流中保持底栖低速区。可以将本研究中的方法复制到其他位置，以评估设计标准（例如，坡度，容量，粗糙度，