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Browsing by Author "Glazer, Jean"

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The 2018 Operation Management Procedure for the South African Merluccius paradoxus and M. capensis Resources

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S ; Glazer, Jean ; Fairweather, Tracey Date: 2019 Specifications and projection results for the 2018 Operational Management Procedure used for setting South African hake Total Allowable Catches are provided along with various background information, including details of the metarule processes. Read more
The 2018 Operational Management Procedure for the South African Merluccius paradoxus and M. capensis resources.

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S ; Glazer, Jean ; Fairweather, Tracey Date: Oct 2018 Specifications and projection results for the 2018 OMP used for setting SA hake TACs are provided along with various background information, including details of the metarule process. Read more
2020 sole dynamic Schaefer production model results

Author: Glazer, Jean ; Butterworth, Doug Date: 2020 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 ... Read more
Adjustments made to recent catches and CPUE for West Coast Rock Lobster in Areas 3+4 and 5+6

Author: Butterworth, Doug S ; Glazer, Jean ; Johnston, Susan ; van Zyl, Daniel Date: Aug 2018 During the 2017/18 fishing season, some catches made in Area 3+4 by trapboats were landed in Area 5+6 as hoopnet catches. This document reports the methodology used and the results obtained from an attempt to correct the catches reported for ... Read more
Considerations on management of the chokka squid jig fishery with reference to the pending FRAP 2020 allocation of fishing rights and implementation of Small Scale Fisheries

Author: Mwicigi, Jean ; Durholtz, Deon ; Glazer, Jean ; Butterworth, Doug S Date: Aug 2018 The South African squid jig fishery is primarily managed using effort control. The management objective for the fishery is to cap effort at a level that secures the greatest catch, on average, in the longer term without exposing the resource ... Read more
Exploratory analyses of the Agulhas sole assessment

Author: Glazer, Jean ; Butterworth, Doug S Date: Mar 2018 A number of different production model approaches are considered for assessment of the Agulhas sole resource, Stationary models, either with observation error only estimation, or adding annual process error, exhibit systematic patterns in ... Read more
Further sole dynamic Schaefer production model results

Author: Butterworth, Doug S ; Glazer, Jean Date: 2019 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 ... Read more
Hake Data: problems, solutions and GLM CPUE sensitivity to alternate scenarios

Author: Fairweather, Tracey ; Glazer, Jean ; Leslie, Rob ; de Decker, Michelle ; Johnston, Susan ; Butterworth, Doug S Date: 2009 The checks carried out on the hake offshore trawl catch and effort data, which provide the basis to split the catches by species and to obtain GLM-standardised CPUE indices of abundance by species, have focused on two separate steps. The first ... Read more
South coast rock lobster OMP 2019

Author: Johnston, Susan ; Butterworth, Doug S ; Glazer, Jean Date: 2019 This document provides the full specification and rationale for the south coast rock lobster OMP 2019 Read more
An updated assessment of the Agulhas sole resource, Austroglossus pectoralis.

Author: Glazer, Jean ; Butterworth, Doug S Date: Oct 2018 Butterworth and Glazer (2014) reported results from the application of a simple form of the dynamic Schaefer model to account for a large drop in sole CPUE over the period 2009-2013. The two hypotheses considered were (i) the drop in CPUE was ... Read more
Updated calculations related to the additional closed season.

Author: Glazer, Jean ; Butterworth, Doug S ; Durholtz, Deon Date: 2019 The length of the additional closed season which would need to be applied to the squid jig commercial sector to keep effort within the TAE has been re-calculated taking into account that the TAE recommendation for the 2019/20 fishing season ... Read more