Extrapolation of recruit numbers to Cape Infanta in the years for which the survey only reached Cape Agulhas

De Moor, Carryn L; Butterworth, Doug S

Extrapolation of recruit numbers to Cape Infanta in the years for which the survey only reached Cape Agulhas

Working Paper

2011

Publisher

University of Cape Town

Department

Marine Resource Assessment and Management Group

Faculty

Faculty of Science

Abstract

The time series of sardine and anchovy recruits used in assessments and to set the final anchovy TAC and sardine TAB in June each year are based on the surveyed area west of Cape Infanta. In some years, the survey did not cover the full area eastwards to Cape Infanta. The first and urgent year for consideration is the survey in 2011 for which the area covered was west of Cape Agulhas only because of damage to the survey vessel. The second set of years for consideration are 1985-1990 when the survey was regularly terminated at Cape Agulhas. In this document we recommend an approach to deal with the survey estimate of recruit numbers and associated variance in such years.

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