A record of the generation of data used in the 2012 sardine and anchovy assessments

De Moor, Carryn L; Coetzee, J; Durholtz, D; Merkle, D; van der Westhuizen, J J; Butterworth, Doug S

A record of the generation of data used in the 2012 sardine and anchovy assessments

Working Paper

2012

Publisher

University of Cape Town

Department

Marine Resource Assessment and Management Group

Faculty

Faculty of Science

Abstract

The data to which the South African anchovy and sardine assessments are tuned are not raw data. Some of the data have already been subjected to a number of analyses and refinements. These associated calculations are often done “behind the scenes” and their details are seldom recorded. This lack of record can result in a discontinuity in the method used to calculate data for subsequent assessments, particularly if assumptions made in the calculations are not documented and/or a new person becomes responsible for developing the data to be used for input to the assessment. This document serves to record the generation from the raw data of the data used in the anchovy and sardine assessments carried out in 2012. It is an update of de Moor et al. 2011 to include data from November 2010 to October 2011 and new proportions and weights-at-age for anchovy. All files referred to below are available from the first author.

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