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Size-based theory for fisheries advice

机译：基于大小的渔业建议理论

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Fisheries science and management is founded upon the Beverton-Holt theory of fish stock demography. The theory uses age as the structuring variable; however, there are several reasons to use body size as the structuring variable. Most of the processes that affect a fish are determined by its body size rather than its age: consumption, mortality, maturation, fecundity, fish gear selectivity, etc., and measurements of body size are easy, accurate, and abundant. Here, I review size-based theory of a fish stock and compare it to classic age-based theory. I show that size- and age-based demography are equivalent representations of demography. However, size-based theory is axiomatic, which leads to a deeper theory with two advantages: predictions need fewer parameters than age-based theory and the theory connects directly to life-history traits. The connection with traits makes size-based theory particularly useful for data-poor application and facilitates evolutionary calculations. I compare age- and size-based theories for fisheries impact and stock assessments and provide a perspective on the challenges and future of single-stock theory.
机译：渔业科学与管理是基于鱼储存人口统计学的贝弗顿-Holt理论。该理论使用年龄作为结构变量;但是，使用身体大小作为结构变量存在若干原因。影响鱼类的大多数过程由其体型而不是其年龄决定：消耗，死亡率，成熟，繁殖力，鱼齿系选择性等，以及体型的测量方便，准确，充足。在这里，我审查了基于尺寸的鱼类理论，并将其与经典年龄的理论进行比较。我表明大小和年龄和年龄的人口摄影是人口统计学的等同表。然而，基于尺寸的理论是公理的，这导致了一个更深入的理论，具有两个优点：预测需要比基于年龄的年龄的理论更少的参数，并且该理论直接连接到终身历史特征。与特征的连接使得基于尺寸的理论对数据较差的应用特别有用，并有助于进化计算。我比较基于年龄和规模的渔业影响和股票评估的理论，并提供了单股挑战和未来的视角。

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