Author:Coetzee, J C; de Moor, C L; Butterworth, Doug SDate:2019The 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
Author:Mouton, Hendrik DDate:2021Many comparisons between Euler angle and quaternion representations of body rotations have been done in the past, but what are additionally investigated in this article are the handling of the generally important non-zero starting conditions, ...Read morecb
Author:Mouton, Hendrik DDate:2021The four major topologies for inductive couplers (such as transformers with air gaps used for wireless power transfer), are discussed in many articles widely available. In this article all the relevant transfer functions and design equations ...Read morecb
Author:de Moor, CarrynDate:2018The 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 hereinRead more
Author:Rademeyer, Rebecca; Butterworth, Doug SDate:2020The Statistical Catch-at-Age (SCAA) assessment methodology applied to the Greenland halibut resource in 2017 is updated to take further data now available for the years 2017 to 2019 into account. Results are reported for a Base Case corresponding ...Read more
Author:Johnston, Susan; Butterworth, DougDate:2020Development of a revised OMP (OMP 2020) for the Tristan island rock lobster resource first leads to a recommendation to include the annual Edinburgh/GS CPUE and the biomass survey index as well as the Tristan powerboat CPUE index as inputs ...Read more
Author:Johnston, Susan; Butterworth, DougDate:2020The performances of a number of OMP candidates for the fishery for rock lobster at Nightingale are reported. These performances do not show much variation amongst the various candidates. For this and other reasons it is recommended that CMP9 ...Read more
Author:Brandão, Anabela; Butterworth, DougDate:2020Brandão and Butterworth (2019a) investigated various target-based Candidate Management
Procedures (CMPs) for the Prince Edward Islands toothfish resource; however, their
performances under some operating models were not satisfactory so that ...Read more
Author:de Moor, CarrynDate:2020This document considers the short‐ and medium‐term impact of a range of future constant catch scenarios on the
anchovy resource to assist the SWG‐PEL in making a scientifically justified initial anchovy TAC recommendation.
Projections are ...Read more
Author:de Moor, CarrynDate:2020The quantitative assessment of the South African sardine resource, using data from 1984 to 2018 has been finalised. This
two mixing‐component model assumed no stock recruitment relationship during conditioning. The west component
abundance ...Read more
Author:de Moor, Carryn; Coetzee, Janet; Butterworth, DougDate:2020A prior distribution for the bias of the hydro‐acoustic survey estimates of the biomass of the South African
anchovy is developed by considering the bias associated with the individual sources of error.Read more
Author:de Moor, CarrynDate:2020A number of sensitivity tests to assumptions underlying the baseline assessment of South African anchovy have been
undertaken. From the results presented in this document, a sub‐set of these sensitivity tests are highlighted as
important ...Read more
Author:de Moor, CarrynDate:2020A number of sensitivity tests to assumptions underlying the baseline assessment of South African sardine have been
undertaken. Sardine recruitment is highly variable and there is no clear stock recruit relationship for the west or
south ...Read more
Author:Glazer, Jean; Butterworth, DougDate:2020The 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
Author:Brandão, Anabela; Butterworth, Doug; Johnston, SusanDate:2020An Age-Structured Production Model is applied to assess the Alfonsino (Beryx splendens) resource in the West and East SIOFA areas of the Southern Indian Ocean. Data limitations restrict these applications to deterministic variants, which ...Read more
Author:Krönke, Matthias; Lockwood, Sarah J; Mattes, RobertDate:Oct 2020The conventional view holds that most of Africa’s political parties are organizationally weak, with little grassroots presence. Yet few studies are based on systematically collected data about more than a handful of parties or countries at ...Read more
Author:Cox, Glenda; Willmers, Michelle; Masuku, BiancaDate:Apr 2019This presentation reports on preliminary findings from DOT4D research, providing an overview of the project’s working conceptual framework which draws upon Nancy Fraser’s theorising on social justice (2005) and Margaret Archer’s (2000) ...Read morecb
Author:Cox, Glenda; Willmers, Michelle; Masuku, BiancaDate:Nov 2019Open textbook initiatives have been successful in the United States and Canada as a means to save money for students. At the University of Cape Town (UCT), the Digital Open Textbooks for Development (DOT4D) project, which began in July 2018, ...Read morecb
Author:Ross-Gillespie, Andrea; Butterworth, Doug SDate:2019The GLMM model to estimate the impact of fishing on penguins at the St Croix and Bird Island colonies is updated given further data. For trip length and duration data, there is no evidence to suggest a statistically significant impact of ...Read more
Author:Ross-Gillespie, Andrea; Butterworth, Doug SDate:2019The Reference Case Ricker model is updated with commercial and survey data from 2018 and 2019. The updated data points lie within the bounds predicted by OMP2018 projections, except for the 2018 proportion of M. capensis in the South Coast ...Read more
