Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
The distributional extent of Pacific salmon (Oncorhynchus spp.) in the North American Arctic is unresolved. While adult Pacific salmon have a recurring presence across the Alaskan North Slope and into the Canadian Arctic, it is uncertain if these fish are part of established Arctic populations, vagrants from outside sources reproducing unsuccessfully, or both. Here we present the first confirmed record of a juvenile chum salmon (Oncorhynchus keta) captured in the nearshore marine ecosystem in the North American Arctic. This provides the first scientific evidence of successful spawning and early marine survival of Pacific salmon in the North American Arctic. It was caught near Kaktovik, Alaska, in August 2017 with a group of similarly sized age-0 Mackenzie River Arctic cisco (Coregonus autumnalis). Stable isotope and otolith microchemistry analyses are consistent with use of the nearshore estuarine corridor from the Mackenzie River west along the northern coast. This contributes critical information needed to identify, manage, and conserve biodiversity at the northern range edge and will help to clarify the status of Pacific salmon as potentially emerging fisheries develop in the North American Arctic due to climate warming.

中文翻译：

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第一条幼鱼鲑鱼证实太平洋鲑鱼在北美北极地区成功繁殖

加拿大渔业和水生科学杂志，印刷前。
太平洋鲑鱼（Oncorhynchus spp.）在北美北极地区的分布范围尚未确定。虽然成年太平洋鲑鱼在阿拉斯加北坡和加拿大北极地区反复出现，但不确定这些鱼是已建立的北极种群的一部分，还是来自外部来源繁殖失败的流浪者，或两者兼而有之。在这里，我们展示了在北美北极近岸海洋生态系统中捕获的幼年鲑鱼 (Oncorhynchus keta) 的首次确认记录。这为太平洋鲑鱼在北美北极地区成功产卵和早期海洋生存提供了第一个科学证据。它于 2017 年 8 月在阿拉斯加的卡克托维克附近与一群大小相似的 0 岁麦肯齐河北极思科（Coregonus fallalis）一起被捕获。稳定同位素和耳石微化学分析与使用沿北部海岸的 Mackenzie 河以西的近岸河口走廊一致。这提供了识别、管理和保护北部山脉边缘生物多样性所需的关键信息，并将有助于澄清太平洋鲑鱼的状况，因为气候变暖导致北美北极地区潜在的新兴渔业发展。