FISHERIES_2016_OCT_SWG-DEM_73 (Kingklip Replacement Yield update) amended.pdf (394.24 kB)
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Results for a “Replacement Yield” model fit to catch and survey data for the South and West Coasts kingklip resource of South Africa

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posted on 22.07.2022, 09:23 authored by Anabela BrandaoAnabela Brandao, Doug ButterworthDoug Butterworth

Given the addition of updated and further data, the previous approach used to compute replacement yields (RY) for kingklip no longer provides satisfactory estimates of survey catchability q. Over a range of q values on the South coast from 0.1 to 0.7, the estimated RY increases from 760 to 1814 tons, compared to the previous estimate of 1614 tons. Correspondingly for the West coast, the RY decreases from 4253 to 2435 tons, compared to the previous estimate of 4102 tons. Suggestions are made of how the DWG might take this matter forward to develop catch limit recommendations based on the RY approach.

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Department of Mathematics and Applied Mathematics, University of Cape Town