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Browsing by Author "Ross-Gillespie, Andrea"

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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
Application of a photo-identification based assessment model to southern right whales in South African waters, now including data up to 2012

Author: Brandão, Anabela ; Butterworth, Doug S ; Ross-Gillespie, Andrea ; Best, Peter B Date: 2013 This paper extends the analyses of Brandão et al. (2012) which applied the three-mature-stages (receptive, calving and resting) model of Cooke et al. (2003) to photo-identification data available from 1979 to 2010 for southern right whales ... Read more
Assessment results for humpback breeding stocks D, E1 and Oceania following recommendations from SC 65a

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S ; Johnston, Susan J Date: 2014 Following recommendations made at IWC 65a, 2013, a single-stock BSD (Breeding Stock D, West Australia) model has been run for a range of Antarctic catch boundaries, and some two-stock BSE1 (Breeding Stock E1, East Australia)+BSO (Breeding ... Read more
Bridge-building between the 2017 and 2018 hake RC assessment models

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S Date: Nov 2018 A step-by-step set of results is given to indicate the impacts of various changes made to the hake assessment Reference Case model over the since May of 2017 Read more
Bridge-building between the 2017 and 2018 hake RC assessment models

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S ; Durholtz, Deon Date: May 2018 A step-by-step set of results is given to indicate the various impacts of various changes made to the hake assessment Reference Case model over the past 12 months. Read more
A comparison between the hake cannibalism and inter-species predation models presented in Bergh et al. (2016) and Ross-Gillespie (2016)

Author: Ross-Gillespie, Andrea Date: Mar 2016 Read more
Conditioning of the hake OMP2018 Reference Set models

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S Date: May 2018 An associated brief background and the first set of results are presented for the conditioning of the OMP2018 Reference Set (RS) models. Read more
Conditioning of the hake OMP2018 Reference Set models with the Model A6b input data.

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S Date: Jul 2018 Results are provided for the reconditioning of the hake OMP 2018 Reference Set with “data” forthcoming from the species splitting algorithm Model A6b. The results are similar to the ones provided previously in FISHERIES/2018/MAY/SWG-DEM/21. ... Read more
Constant catch projections for the RS for the 2018 hake OMP review

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S Date: Aug 2018 The RS Operating Models are projected forward under a range of constant future annual TACs from 130 000t to 160 000t to provide an initial scale on what TACs may maintain the M. paradoxus resource above BMSY. A basis for projecting the future ... Read more
Details of updates made to the Reference Case specifications from the time of the 2017 MSC audit.

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S Date: Jul 2018 Details are provided of the changes that have been made to the South African hake Reference Case assessment model since the time of the 2017 MSC audit. Read more
Does parasite infection definitely increase for sardine aged 2 and above on the south coast

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S Date: 2014 The trend with length in parasite prevalence in sardine on the South Coast is modelled in a manner that isolates behaviour at larger lengths to enable a determination of whether the trend continues to increase from age one to ages of two ... Read more
Evaluating the accuracy of hake abundance index predictions using different smoothing techniques

Author: Butterworth, Doug S ; Robinson, William M L ; Ross-Gillespie, Andrea Date: 2013 Alternative projection approaches based on linear and quadratic smoothing are applied retrospectively to abundance indices for hake to ascertain whether they can provide more accurate predictions of resource status one and two years ahead, ... Read more
Exploration of a safe-guard criterion for OMP2018 in the eventuality that the M. capensis CPUE and survey indices of abundance drop too low

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S Date: Nov 2018 A value is sought for the M. capensis combined CPUE and survey index of abundance J which would constitute the threshold below which additional (supra-OMP) management measures would need to be taken (probably in the form of moving the ... Read more
Exploration of a safe-guard criterion for OMP2018 in the eventuality that the M. capensis CPUE and survey indices of abundance drop too low

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S Date: 2018 A value is sought for the M. capensis combined CPUE and survey index of abundance J which would constitute the threshold below which additional (supra-OMP) management measures would need to be taken (probably in the form of moving the ... Read more
First set of robustness tests conducted for OMP2018

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S Date: Nov 2018 Results are presented for a total of ten robustness tests. The first five robustness tests investigate alternative assumptions regarding future surveys and commercial catchability. Further robustness tests involve testing alternative ... Read more
First set of robustness tests conducted for OMP2018

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S Date: 2018 Results are presented for a total of ten robustness tests. The first five robustness tests investigate alternative assumptions regarding future surveys and commercial catchability. Further robustness tests involve testing alternative ... Read more
Full set of results for the CMP recommended to be adopted for OMP2018, including for the robustness tests conducted thus far.

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S Date: Oct 2018 This document either summarises previous reported performance statistics and plots, or extends these, to provide a comprehensive consolidation of such results for the OMP candidate to be recommended for the next hake OMP (control parameters ... Read more
Implementing the 2014 three-stock model for Southern Hemisphere Breeding Stocks E1, Oceania and G

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S Date: 2015 The three stock model approach with mixing on feeding grounds, which was implemented in 2014 to assess the BSD, BSE1 and BSO breeding stocks, is applied in a similar manner to the BSE1, BSO and BSG breeding stocks. This is intended as a first ... Read more
Incorporating cannibalism and inter-species predation effects into the hake assessment model: Methods and some preliminary results

Author: Ross-Gillespie, Andrea ; Butterworth, Doug S Date: 2013 Hake cannibalism and inter-species predation is modelled explicitly using a Type II functional response. Because of the fast dynamics of predation compared to other processes, the standard hake assessment model is converted from a yearly to ... Read more