Assessment of the South African anchovy resource using data from 1984 – 2010: variability in natural mortality

De Moor, Carryn L; Butterworth, Doug S

Assessment of the South African anchovy resource using data from 1984 – 2010: variability in natural mortality

Working Paper

2011

Publisher

University of Cape Town

Department

Marine Resource Assessment and Management Group

Faculty

Faculty of Science

Abstract

Initial results of the updated assessment of the South African anchovy resource, using data from 1984 to 2010, were presented by de Moor and Butterworth (2011). This work included the use of a random effects model for adult natural mortality with a fixed standard deviation of 0.2 and 0.5. This approach has now been further extended such that annual autocorrelation can be included and the associated parameters can be estimated, rather than fixed. Similar testing on the use of random effects models for juvenile natural mortality has also been undertaken.

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