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The 2016 Horse Mackerel Updated Assessment

Author: Johnston, Susan J ; Butterworth, Doug S Date: Sep 2016 FISHERIES/2016/SEP/SWG-DM/51 provides a full description of the current stock assessment model for the South African Horse Mackerel. This document provides the updated 2016 assessment results for a number of model variants. Read more
A 2016 updated assessment of the squid resource, Loligo reynaudii

Author: Glazer, J P ; Butterworth, Doug S Date: Oct 2016 The squid stock assessment model was last implemented in 2013 and at that time included data to 2012. An additional 3 years of data are now available and these have been included in an updated assessment. Sensitivity to incorporating ... Read more c b
The 2017 Horse Mackerel Updated Assessment

Author: Johnston, S J ; Butterworth, Doug S Date: Sep 2017 FISHERIES/2016/SEP/SWG-DM/51 provided a full description of the current stock assessment model for the South African Horse Mackerel. FISHERIES/2016/SEP/SWG-DM/52 reported updated 2016 assessments for a number of model variants where the ... Read more
2017 updated South Coast Rock Lobster assessment results

Author: Johnston, S J ; Butterworth, Doug S Date: Aug 2017 The 2017 assessment of the resource is updated given two further years of data now available. Recruitment is estimated to have increased over the last two seasons compared to the previous three seasons when recruitment was estimated to be ... Read more c b
2018 GLMM-standardised Tristan lobster CPUE compared with the current OMP target levels (Itar)

Author: Johnston, Susan ; Butterworth, Doug S Date: May 2018 This document reports the 2018 GLMM-standardised Tristan lobster CPUE compared with the current OMP target levels that are in place for each island. Read more
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
The 2018 south coast rock lobster reference case operating model

Author: Johnston, Susan ; Butterworth, Doug S Date: 2019 This document details the current 2018 Reference Case Operating Model which is to be proposed to be used for simulation testing of a new OMP for South Coast rock lobster. Read more
2018 Updated horse mackerel assessments

Author: Johnston, Susan ; Butterworth, Doug S Date: Oct 2018 The assessments for the two hypotheses (reduced catchability and a one-off additional mortality event) for the recent reduced Desert Diamond catch rate are updated to take one further year’s data into account. The 2017 CPUE somewhat increased ... Read more
2018 updated south coast rock lobster assessment results

Author: Johnston, Susan ; Butterworth, Doug S Date: 2018 The 2017 assessment of the resource is updated given two further years of catch-at-length data now available. Recruitment is estimated to have increased over the last two seasons compared to the previous three seasons when recruitment was ... Read more
2018 updated south coast rock lobster assessment results

Author: Johnston, Susan ; Butterworth, Doug S Date: 2019 The 2017 assessment of the resource for South Coast rock lobster is updated given the two further years of catch-at-length data and one further year of CPUE data now available. Recruitment is estimated to have decreased over the last two ... Read more
2018 updated west coast rock lobster assessments

Author: Johnston, Susan ; Butterworth, Doug S Date: Nov 2018 A new set of 2018 assessments for all five super-areas for the west coast rock lobster resource has recently been completed. These provide the bases for projecting the resource forwards (in each super-area) under alternative future catches ... Read more
A 2-stock hypothesis for South African sardine: two discrete stocks

Author: de Moor, Carryn L ; Butterworth, Doug S Date: 2009 A 2-stock, 2-area hypothesis for the South African sardine resource is being developed, with the following boundaries: i) A “western” stock distributed throughout the “western area”, defined as the area west of Cape Agulhas ii) An “eastern” ... Read more
A History of recent bases for management and the development of a species-combined Operational Management Procedure for the South African hake resource

Author: Rademeyer, R ; Butterworth, Doug S ; Plagányi, Éva E Date: 2008 The bases for historical catch limits placed on the hake fishery are reviewed in brief for earlier years and then in some depth over the period from 1991 when the Operational Management Procedure (OMP) approach was introduced for this fishery. ... Read more
A statistical model for stock assessment of southern bluefin tuna with temporal changes in selectivity

Author: Butterworth, Doug S ; Ianelli, J N ; Hilborn, R Date: 2003 Assessment of the status of southern bluefin tuna (SBT) by Australia and Japan has used a method (ADAPT) that imposes a number of structural restrictions, and is similar to methods used for a number of stocks world-wide. A flexible method for ... Read more
A summary of the South African sardine (and anchovy) fishery. MARAM/IWS/2019/Sardine/BG1

Author: Coetzee, J C ; de Moor, C L ; Butterworth, Doug S Date: 2019 The sardine fishery is an important component of the South African purse-seine fishery, the largest commercial fishery in South Africa (by landed mass). This fishery, initially established on the West Coast, but with some subsequent infrastructure ... Read more
Abalone spatial- and age-structured assessment model results for Zones A, B, C and D in 2005

Author: Plagányi, Éva E ; Butterworth, Doug S Date: 2005 A summary is presented of the results obtained from the 2005 Reference-case model that was fit to Zones A, B, CNP, CP and D in combination (hereafter referred to as the “combined ABCD model”). The full details of the spatial- and age-structured ... Read more
The abundance of blue whales on the Madagascar Plateau, December 1996

Author: Best, Peter B ; Rademeyer, Rebecca A ; Burton, Chris ; Ljungblad, Don ; Sekiguchi, Keiko ; Shimada, Hiroyuki ; Thiele, Deborah ; Reeb, Desray ; Butterworth, Doug S Date: 2003 As part of the International Whaling Commission’s SOWER blue whale research programme, two sighting vessels, the Shonan Maru and the Shonan Maru No.2 , surveyed the Madagascar Plateau between 25° and 35°S, 40° and 45°E, in December 1996. A ... Read more
Addendum to: Bayesian assessments of Southern Hemisphere humpback whale breeding Sub-stocks C1 and C3, including allowance for interchange on the breeding grounds.

Author: Johnston, Susan J ; Butterworth, Doug S Date: 2009 This Addendum adds results for the Migrant and Tourist models to those reported for the Sabbatical and Resident models in the original paper. Results for the C1 sub-stock are hardly affected, but recovery is slightly less advanced for the C3 ... Read more
Addendum to: Further 2018 west coast rock lobster assessment and associated biomass projections results

Author: Johnston, Susan ; Butterworth, Doug S Date: Aug 2018 This Addendum provides further results for the two-step TAC phase down option, where the distribution of the TAC amongst the Super-areas is changed. The shifts from A8+ are to either or both of A34 and A7. The Results are shown in the Tables ... Read more

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