Research Document - 2013/053
An evaluation of growth models for predicting 2J3KL cod stock weights-at-age
By N. Cadigan
Abstract
Growth models are developed to estimate beginning-of-year weights-at-age for 2J3KL cod based on average weights from samples collected during the fall surveys. Beginning-of-year weights are required for computing beginning-of-year spawning stock biomass. Von Bertalanffy and Gompertz growth models were investigated. There is some evidence of changes in growth rates over time so growth models are fit by cohort. The Gompertz model did not fit the data well and a modification is proposed that results in better fits to the data. The Von Bertalanffy model provided the best fit to the data.
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