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Now showing items 21-40 of 2952

The 2014 Operational Management Procedure for the South African horse mackerel resource

Author: Furman, Liam B Date: 2015 This document specifies the 2014 Operational Management Procedure (OMP) to provide Precautionary Upper Catch Limit (PUCL) recommendations for horse mackerel bycatches in the South African pelagic fishery and Total Allowable Catch (TAC) ... Read more
2015 updated South Coast Rock Lobster assessment results

Author: Johnston, Susan J ; Butterworth, Doug S Date: 2015 The 2013 assessment of the resource is updated given three further years of data now available. Recruitment is estimated to have been poor over the further three seasons for which this can now be estimated. The spawning biomass trajectory ... Read more
The 2016 Horse Mackerel Assessment Model

Author: Johnston, Susan J ; Butterworth, Doug S Date: Sep 2016 Furman (2014) developed and described the horse mackerel assessment model for his MSc thesis. This document extracts pertinent sections from his thesis which describe the population assessment model, and provides a description of assumptions ... Read more c b
2016 Horse Mackerel projections

Author: Johnston, Susan J ; Butterworth, Doug S Date: Oct 2016 The projections conducted in 2015 are updated to include the further data now available. The results are somewhat more positive than previously as a result of the CPUE for 2015, although still low, being higher than that for 2014. Nevertheless, ... Read more
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 Operational Management Procedure for the South African sardine and anchovy resources

Author: de Moor, Carryn Date: 2018 The Operational Management Procedure (OMP) to be used to recommend total allowable catches and bycatches for sardine and anchovy in South African waters has been updated and is detailed herein 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
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
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 case study of water sources and water quality of the Chalumna/Hamburg area of Ciskei

Author: Stone, A. Date: 28 May 2015 Water resources, Ciskei Read more