Population declines and demographic changes of Chinook salmon (Oncorhynchus tshawytscha), have been documented throughout this species’ range, though information on natural and anthropogenic mechanisms related to these changes are not fully understood. To provide insights into marine behaviors and survival of Chinook salmon, 40 pop-up satellite archival tags (PSATs), that collected environmental data, were attached to large (69–100 cm FL) Chinook salmon caught in the marine waters of Cook Inlet, Alaska. PSATs provided evidence of predation on tagged Chinook salmon by ectothermic and unconfirmed predators, and provided valuable information about the migratory characteristics and occupied depths and temperatures of this species while occupying Cook Inlet and the Gulf of Alaska. The results from this study suggest that late-marine mortality of Chinook salmon of a variety of stock-origins by apex predators is more common in Cook Inlet than previously thought, and may be used to improve our understanding this species’ population dynamics. Furthermore, results from this study adds to the existing knowledge of marine habitat use by Chinook Salmon and may be useful in assessing the vulnerability and interactions between this species and anthropogenic activities.

奇努克鲑鱼的种群减少和人口变化（Oncorhynchus tshawytscha），虽然尚未完全了解与这些变化相关的自然和人为机制信息，但已在该物种的整个范围内进行了记录。为了提供有关奇努克鲑鱼海洋行为和生存情况的见识，将40个弹出式卫星档案标签（PSAT）收集了环境数据，并贴在捕获在库克湾海水中的大型（69–100 cm FL）奇努克鲑鱼上，阿拉斯加州。PSATs提供了由外来的和未经证实的捕食者捕食带标签的奇努克鲑鱼的证据，并提供了有关该物种在占领库克湾和阿拉斯加海湾时的迁徙特征以及所占据的深度和温度的有价值的信息。这项研究的结果表明，在库克湾（Cook Inlet），食源性捕食者以各种原产地的奇努克鲑鱼的后期海洋死亡率比以前认为的要普遍得多，可用于增进我们对这一物种种群动态的了解。此外，这项研究的结果增加了奇努克鲑鱼使用海洋栖息地的现有知识，可能有助于评估该物种与人为活动之间的脆弱性和相互作用。