Further sole dynamic Schaefer production model results

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2019

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http://hdl.handle.net/11427/32125
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FISHERIES_2019_OCT_SWG-DEM_42 Sole assessment_fin.pdf (278.46 KB)
Authors
Butterworth, Doug S
Glazer, Jean
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Department of Mathematics and Applied Mathematics
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Faculty of Science
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Abstract
The sole resource is modelled by a dynamic Schaefer production model which allows for a drop in the value of the intrinsic growth rate parameter from 2000 onwards. The model is fit to the available CPUE and survey abundance indices. These data are not sufficiently informative to be able to distinguish amongst fairly wide ranges of pre- and post-2000 intrinsic growth rate parameters. Nevertheless, all suggest that the sole resource has never been substantially depleted (being well above its MSY level), and furthermore that the current replacement yield and MSY are reasonably robustly estimated in the ranges of 300-400 and 500-650 mt respectively.
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Reference:

Butterworth, D. & Glazer, J. 2019. Further sole dynamic Schaefer production model results. ,Faculty of Science ,Department of Mathematics and Applied Mathematics. http://hdl.handle.net/11427/32125 .

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