Funding information Environment Agency; EU AMBER (Adaptive Management of Barriers in European Rivers) project, Grant/Award Number: 689682 Abstract Many rivers are heavily fragmented, resulting from anthropogenic cross-channel structures. Cost-effective solutions are needed to restore habitat connectivity for migratory fishes, including those of conservation concern, such as the European river lamprey (Lampetra fluviatilis). Studded material is becoming increasingly used as a low-cost retrofit solution for lamprey passage at sloping weirs, although little is known about the efficacy of the material or what stud arrangements may be most effective. This study tested whether expanding a single-density studded tile (SDT) lane from 1 to 2-m width increased passage success (nreleased = 133), and also compared the passage performance between a SDT lane and a dual-density studded tile (DDT) lane (nreleased = 115) at a sloping weir, using PIT telemetry. No passage was recorded (nattempted = 89) at the 2-m wide SDT lane, but 61.6% (npassed/ attempted = 53/86) passed using DDT/SDT lane combination. However, increased passage efficiency was likely a result of high river flow (Q2.0-Q30.6) during DDT/SDT comparison versus low (Q8.3-Q88.5) while the 2-m wide SDT lane was employed. There was no evidence that passage occurred using solely one stud configuration. It is, therefore, hypothesised that passage of river lamprey at weirs is more dependent on flow regime than the provision of either stud configuration. However, with 46.1% (npassed/released = 53/115) of those released during DDT/SDT comparison passing on the instrumented section (10.5% of weir face), the provision of studded tiles may aid in lamprey passage at high flows, presumably as the tiles generate a low-velocity boundary layer that can be utilised as lamprey swim above the studs.

中文翻译：

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上游迁移的欧洲七鳃鳗的河流连通性恢复：两种水平安装的镶钉瓷砖设计的功效

资金信息环境局；EU AMBER（欧洲河流障碍适应性管理）项目，资助/奖励编号：689682 摘要 由于人为跨河道结构，许多河流严重支离破碎。需要具有成本效益的解决方案来恢复洄游鱼类的栖息地连通性，包括那些具有保护意义的鱼类，例如欧洲河七鳃鳗 (Lampetra fluviatilis)。螺柱材料越来越多地用作倾斜堰上七鳃鳗通道的低成本改造解决方案，尽管人们对这种材料的功效或哪种螺柱布置可能最有效知之甚少。这项研究测试了将单密度镶钉瓷砖 (SDT) 车道从 1 米宽扩大到 2 米是否会增加通过成功率 (nreleased = 133)，还使用 PIT 遥测比较了倾斜堰上 SDT 车道和双密度镶嵌瓷砖 (DDT) 车道（nreleased = 115）之间的通道性能。在 2 米宽的 SDT 泳道上没有记录通过（未尝试 = 89），但使用 DDT/SDT 泳道组合通过了 61.6%（未通过/尝试 = 53/86）。然而，在使用 2 米宽的 SDT 车道时，在 DDT/SDT 比较期间，高流量（Q2.0-Q30.6）与低流量（Q8.3-Q88.5）相比，提高了通过效率。没有证据表明仅使用一种螺柱配置会发生通过。因此，假设河流七鳃鳗在堰上的通过更多地依赖于流态，而不是提供任何一种螺柱配置。然而，在 DDT/SDT 比较期间释放的那些中有 46.1%（npassed/released = 53/115）通过了检测部分（10.