A Stochastic Implementation of an Age-Structured Production Model
V.R. Restrepo and C.M. Legault
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An age-structured production model (ASPM) has been used by the International Commission for the Conservation of Atlantic Tunas for the assessments of some stocks. That model is sometimes preferable to traditional biomass-based surplus production models because it can accommodate age-structured indices of relative abundance. The traditional ASPM estimates a deterministic stock-recruitment relationship, a property that may result in inconsistencies between the estimated level of recruitment and the observed level of catches. In this work we relax the deterministic assumption by incorporating stochasticity in recruitment around the deterministic predictions as a first order, autoregressive time-series process. We use data for western Atlantic bluefin tuna to contrast the deterministic and stochastic model fits.
- Item number: AK-SG-98-01v
- Year: 1998
- DOI: https://doi.org/10.4027/fsam.1998.22