University of Cape Town
MARAM_IWS_DEC13_Hake_P1.pdf (573.71 kB)

An update of the catchability calibration factor between the Africana with the old and the new gear, with an attempt to estimate its length-dependence

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posted on 2023-06-22, 09:06 authored by Rebecca A Rademeyer, Doug ButterworthDoug Butterworth

The 2004 analysis providing a catchability ratio for the Africana with the new compared to the old gear is refined and extended given additional data. The results of 1.18 (SE 0.10) for this ratio for M. paradoxus and 0.72 (SE 0.05) for M. capensis are both somewhat higher than obtained previously, primarily as a result of the additional data now available. An attempt is made at estimating the length dependence of these calibration factors, but the data are found to have insufficient information content to justify this.



Department of Mathematics and Applied Mathematics, University of Cape Town