Abstract Stock structure is one of the fundamental assumptions for assessing and managing fisheries resources. Investigation of stock structure should be conducted holistically, involving reviews of as much information as possible, because suggested conclusions from different studies are often contradictory. Here, all available information related to the stock structure of Pacific bluefin tuna (Thunnus orientalis), whose stock status is of concern, was reviewed to consider an appropriate stock structure hypothesis for management purposes. Although current stock assessment of this species assumes that it is a single-stock resource, it has two, or possibly three, known spawning grounds and exhibits complex migration behavior. Nevertheless, to date there is no documentation of its stock structure per se, and it thus warrants a thorough review. After analyzing a variety of studies regarding Pacific bluefin tuna, no information exclusively pointing to the existence of multiple stocks was identified. Instead, many studies support the conclusion that Pacific bluefin tuna from the two spawning grounds mix as the tuna grows. Therefore, it is considered appropriate to manage Pacific bluefin tuna as a single stock. This is an important conclusion for its management, particularly for the pending management strategy evaluation for this stock, which should account for all major sources of uncertainty including plausible stock structure hypotheses.

中文翻译：

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用于管理目的的太平洋蓝鳍金枪鱼（Thunnus orientalis）的种群结构——现有信息回顾

摘要 种群结构是渔业资源评估和管理的基本假设之一。对种群结构的调查应全面进行，包括对尽可能多的信息进行审查，因为不同研究得出的结论往往相互矛盾。在这里，审查了与太平洋蓝鳍金枪鱼（Thunnus orientalis）种群结构相关的所有可用信息，其种群状况受到关注，以考虑出于管理目的的适当种群结构假设。尽管目前对该物种的种群评估假设它是单一种群资源，但它有两个或可能三个已知的产卵场，并表现出复杂的迁徙行为。然而，迄今为止，没有关于其股票结构本身的文件，因此需要彻底审查。在分析了有关太平洋蓝鳍金枪鱼的各种研究后，没有发现专门指出存在多种种群的信息。相反，许多研究支持这样的结论，即来自两个产卵场的太平洋蓝鳍金枪鱼随着金枪鱼的生长而混合。因此，将太平洋蓝鳍金枪鱼作为单一种群进行管理被认为是合适的。这是对其管理层的重要结论，特别是对于该股票的待定管理策略评估，它应考虑所有主要的不确定性来源，包括合理的股票结构假设。许多研究支持这样的结论，即来自两个产卵场的太平洋蓝鳍金枪鱼随着金枪鱼的生长而混合。因此，将太平洋蓝鳍金枪鱼作为单一种群进行管理被认为是合适的。这是对其管理层的重要结论，特别是对于该股票的待定管理策略评估，它应考虑所有主要的不确定性来源，包括合理的股票结构假设。许多研究支持这样的结论，即来自两个产卵场的太平洋蓝鳍金枪鱼随着金枪鱼的生长而混合。因此，将太平洋蓝鳍金枪鱼作为单一种群进行管理被认为是合适的。这是对其管理层的重要结论，特别是对于该股票的待定管理策略评估，它应考虑所有主要的不确定性来源，包括合理的股票结构假设。