In the western United States, the introduction of nonnative Brook Trout Salvelinus fontinalis has had deleterious effects on native Cutthroat Trout Oncorhynchus clarkii subspecies, and often their populations must be controlled or removed if Cutthroat Trout are to persist. Man‐made fish migration barriers are integral components of stream restoration projects, and typical designs are intended to be permanent and to funnel water over a drop and onto a splash pad. The water elevation drop and the splash pad, which prevents a jumping pool, are mechanisms intended to prevent fish from navigating upstream past the structure. In this study, we installed a temporary, permeable‐style barrier that was designed to have water flow onto and through a horizontal, expanded steel panel. When fish attempted to move upstream, they would follow the water flow and end up underneath the barrier, with no opportunity to move further. The permeable barrier proved effective in preventing the upstream movement of Brook Trout, and additional advantages to this barrier style included straightforward permitting, low cost, ease of installation, and quick removal. The main disadvantage was the periodic cleaning (average of 7 trips/year) that was required to maintain its intended function. The permeable barrier separated stream reaches for 5 years, allowing biologists to (1) eradicate Brook Trout upstream through multiple‐pass backpack electrofishing while preserving native Yellowstone Cutthroat Trout O. clarkii bouvieri and (2) apply a successful piscicide treatment below the barrier.

中文翻译：

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评估渗透型鱼类屏障，以防止在消灭工程中非本地化鳟鱼的上游再定殖

在美国西部，非本地布鲁克鳟鱼Salvelinus fontinalis的引入对本地割喉鳟鱼Oncorhynchus clarkii产生了有害影响。如果要坚持割喉鳟鱼，则必须控制或清除其亚种，并且通常必须控制其种群。人造鱼迁移障碍是河流修复项目不可或缺的组成部分，典型的设计旨在保持永久性，并将水滴落到防溅垫上。水位下降和防止跳水池的防溅板是旨在防止鱼类向上游航行越过建筑物的机制。在本研究中，我们安装了一个临时的，可渗透式的屏障，该屏障的设计目的是使水流入并通过水平扩展钢板。当鱼类试图向上游移动时，它们会跟随水流并最终到达障碍物下方，而没有机会继续前进。渗透性屏障被证明可以有效防止布鲁克鳟鱼向上游移动，这种屏障类型的其他优点包括直接许可，低成本，易于安装和快速移除。主要缺点是需要定期清洁（平均每年7次）以保持其预期功能。渗透性屏障分离的水流达到5年，使生物学家（1）通过多遍背包电钓鱼在上游消灭布鲁克鳟鱼，同时保留了天然的黄石残酷的鳟鱼O. clarkii bouvieri和（2）在屏障下方成功应用了杀虫剂处理。