Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
Managing and conserving threatened migratory salmonid populations in large river–lake ecosystems is challenging not only because of the ecosystems’ large size, but also because there is often more than one anthropomorphic stressor. The River Klarälven – Lake Vänern ecosystem, situated in Norway and Sweden, is a large, highly modified ecosystem, home to a threatened, endemic, large-bodied population of landlocked Atlantic salmon (Salmo salar). With 11 dams, the salmon population has been maintained through extensive stocking and a truck and transport system for spawners. Here we review what we have learned about the salmon after 15 years of research, highlighting the major findings for each life stage. Our studies indicate that the salmon population is below carrying capacity, and we suggest measures to increase the number of spawners and downstream passage success. Habitat restoration to compensate for losses from former log-driving activities is expected to further increase carrying capacity. Re-establishing salmon in Klarälven’s upper reaches in Norway, while possible, is fraught with both ecological and legislative hurdles. Substantial long-term funding is needed to foster co-management and ensure a sustainable fishery.

中文翻译：

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大型河湖生态系统中的内陆大西洋鲑鱼：管理具有高保护价值的地方性大体种群

《加拿大渔业和水生科学杂志》，印刷前。
在大型河湖生态系统中管理和保护受威胁的迁徙鲑鱼种群不仅具有很大的挑战性，还因为其生态系统规模庞大，而且还因为通常存在多个拟人应激源。位于挪威和瑞典的克拉拉尔文河-韦纳湖生态系统是一个经过高度改造的大型生态系统，是内陆大西洋鲑鱼（萨尔摩鲑鱼）受威胁的地方性大批种群的家园。拥有11个水坝，鲑鱼种群已通过大量放养以及产卵场的卡车和运输系统得以维持。在这里，我们回顾了经过15年研究的鲑鱼知识，重点介绍了每个生命阶段的主要发现。我们的研究表明，鲑鱼种群低于承载能力，并且我们建议采取措施来增加产卵器的数量和下游通道的成功率。恢复生境以补偿以前的原木驾驶活动造成的损失，有望进一步提高承载能力。在挪威克拉拉文上游重建鲑鱼时，可能会遇到很多生态和法律障碍。需要大量的长期资金来促进共同管理并确保可持续渔业。