Understanding salmonid discharge requirements can help inform management to conserve wild populations in a changing climate. This study developed Bayesian hierarchical mixed‐effects models relating 0+ Atlantic salmon (Salmo salar L.) and trout (Salmo trutta L.) densities to different aspects of river discharge. Associations between these densities and nine hydrological variables representing the magnitude, frequency and duration of discharge events were evaluated using historical monitoring data from 36 sites on five rivers in England and Wales. All hydrological variables had weak associations with 0+ salmonid densities. More frequent high discharges between spawning and emergence were positively and negatively associated with 0+ salmon and trout densities, respectively. High discharges might increase spawning site availability for salmon and decrease egg‐to‐fry survival for trout. However, overall, only equivocal evidence was found regarding which discharge aspects affect juvenile salmonid densities. Therefore, a strategic review of juvenile salmonid monitoring programmes integrating environmental data collection is recommended.

中文翻译：

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是否可以使用来自英国五条河流的历史监测数据来确定与少年大西洋鲑（Salmo salar L.）和鳟鱼（S. trutta L.）密度有关的排放方式？

了解鲑鱼排放的要求可以帮助管理人员保护气候变化中的野生种群。这项研究开发了与0+大西洋鲑（Salmo salar L.）和鳟鱼（S almo trutta）相关的贝叶斯分层混合效应模型L.）河流排放不同方面的密度。使用来自英格兰和威尔士五条河流的36个站点的历史监测数据，评估了这些密度与代表排放事件的大小，频率和持续时间的9个水文变量之间的关联。所有水文变量与0+鲑鱼密度的关联都很弱。产卵和出苗之间更频繁的高排放分别与鲑鱼和鳟鱼的密度为0+正相关和负相关。高排放量可能会增加鲑鱼产卵场所的利用率，并降低鳟鱼的卵到鱼的存活率。但是，总体而言，仅发现模棱两可的证据表明哪些排放方面会影响少年鲑鱼的密度。因此，