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Surplus production models (e.g. the Schaefer, Fox, and Pella–Tomlinson models) aggregate the dynamics of a fish population into a simple function of abundance and do not explicitly represent biological and fishing processes. It has been shown that the shape of the production function depends on biological parameters such as natural mortality, growth, and the stock–recruitment relationship. It also...
Swordfish are known to be sexually dimorphic. However, previous assessments of the status of swordfish in the North Pacific Ocean have not been based on population models that distinguish the sexes. A sex-specific age-structured assessment model was therefore constructed for the stock of swordfish in the North Pacific Ocean. However, prior to the application of this method to the data for the stock...
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