How should the sardine length frequencies be weighted?

De Moor, Carryn L; Butterworth, Doug S

How should the sardine length frequencies be weighted?

Working Paper

2009

Publisher

University of Cape Town

Department

Marine Resource Assessment and Management Group

Faculty

Faculty of Science

Abstract

Length frequencies are calculated for the annual sardine November surveys using samples from trawls undertaken during the spawner biomass acoustic surveys and using a method of calculation that was developed by Roel and probably also Hampton (Coetzee pers. comm.). These length frequencies are used in estimating the acoustic biomass and the proportion-at-age at the time of the survey. This document briefly considers the current method used to estimate the survey length frequency and develops some alternative methods. The implications of the alternative methods will be discussed in a future document.

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