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Combined analysis of length and age-at-length data

Martin, I. and Cook, R. M. (1990) Combined analysis of length and age-at-length data. Journal du Conseil - Conseil International pour l'Exploration de la Mer, 46 (2). pp. 178-186. ISSN 0020-6466

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Age—length-key and length-frequency analysis are well-known methods for estimating the proportion of fish at each age in a sample and the associated mean length and standard deviation of length at age. In this paper a combined age—length analysis (CALA) is described which fits a statistical model to both the age and length data. Monte Carlo testing of the methods indicates that the CALA method provides more precise estimates of the parameters than conventional age-length-key methods.