Updated assessment of the South African kingklip resource including an initial attempt at including  catch-at-length data

Brandão, Anabela; Butterworth, Doug S

Updated assessment of the South African kingklip resource including an initial attempt at including catch-at-length data

Journal Article

2008

Publisher

MARAM, University of Cape Town

Publisher

University of Cape Town

Department

Marine Resource Assessment and Management Group

Faculty

Faculty of Science

Abstract

This paper updates the kingklip assessment by Brandão and Butterworth presented earlier this year by taking further data into account. Further, the analysis which treats the resource on both West and South coasts as a single stock is extended to take catch-at-length data into account. If the resource is treated as two separate stocks, current (2008) depletion of spawning biomass on the West and South coasts is estimated at 0,50 and 0.12 respectively. A more optimistic picture is obtained with the resource treated as a single stock, which yields a current depletion estimate of 0.36, which increases to 0.52 if the catch-at-length data are incorporated. Projections indicate that if the South coast component of the resource is a separate stock, then catches would need to be reduced to below 1 000 tons at least for sustainability. However if the two coasts combined are treated as a single stock, projections under current catch levels suggest a slight decrease for the assessment excluding catch-at-length data, which changes to a slight increase when those catch-at-length data are also taken into account..

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