Author:Ross-Gillespie, Andrea; Butterworth, DougDate:Nov 2018A 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
Author:Butterworth, Doug; Johnston, SusanDate:Sep 2018OMPs have recently been accepted as the basis to recommend rock lobster TACs for all four islands
of the Tristan da Cunha Group. The application of these OMPs together with the most recent standardized CPUE data result in the following ...Read more
Author:Butterworth, Doug; Johnston, SusanDate:Jul 2018OMPs have recently been accepted as the basis to recommend TACs for Tristan and Nightingale islands. The application of the OMPs together with the most recent standardized CPUE data result in the following TACs:
The OMP for Tristan sets the ...Read more
Author:Brandão, Anabela; Butterworth, DougDate:Oct 2018The assessment of the Prince Edward Islands (PEI) toothfish (Dissostichus eleginoides) resource carried out by Brandão and Butterworth (2017) is updated to take further data now available for 2017 into account. This update also incorporates ...Read more
Author:Brandão, Anabela; Butterworth, Doug; Johnston, SusanDate:Nov 2018GLM methods are applied to the DAFF “new” compliance database in which policing effort is linked to confiscations taken as well as to the “old” compliance database on confiscations (and abandonments) and on policing effort (but restricting ...Read more
Author:Brandão, Anabela; Butterworth, DougDate:Mar 2018Some simple analyses of the tag-recapture data available for the PEI toothfish
resource are undertaken. Somatic growth rate seems to be less than that in
Subarea 48.3 which has previously been assumed for assessments of the PEI
resource. ...Read more
Author:Brandão, Anabela; Butterworth, DougDate:Aug 2018Analyses of the tag-recapture data available for the PEI toothfish resource are undertaken to evaluate a vessel effect and an area effect on tag recovery rates as well as to determine a possible difference in tagging “success” between the two ...Read more
Author:Brandão, Anabela; Butterworth, DougDate:Sep 2018An updated GLMM standardisation of trotline toothfish CPUE data is presented which includes new data for the 2017 “fishing”-year. Updated standardisation of the trotline CPUE data shows a marked decrease from the 2015 to the 2016 season, with ...Read more
Author:Butterworth, Doug; Glazer, Jean; Johnston, Susan; van Zyl, DanielDate:Aug 2018During 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
Author:Brandão, Anabela; Butterworth, DougDate:Jul 2018Analyses of FIMS data are updated to include data for the 2016/17 and 2017/18 seasons. Results show an increase from the last season’s index for the FIMS relative abundance indices in the Cape Point Zone, although this increase follows from ...Read more
Author:Brandão, Anabela; Butterworth, DougDate:Apr 2018The assumption made that the efficiency for each of the policing effort type is similar which is assumed in the GLM approach to obtain confiscations per unit policing effort index by Brandão et al. (2016) is investigated. Results show that ...Read more
Author:Brandão, Anabela; Butterworth, DougDate:Aug 2018GLM methods are applied to the “new” compliance database in which policing effort is
linked to confiscations taken as well as to the “old” compliance database on confiscations (and
abandonments) and on policing effort (but restricting the ...Read more
Author:Brandão, Anabela; Butterworth, DougDate:Oct 2018For stochastic future recruitment and for annual catch levels of 0, 200, 400, 575 and 675 tonnes, the median of the spawning biomass estimates for the New Base case model drops initially, but returns to its current level within a decade. ...Read more
Author:Brandão, Anabela; Butterworth, DougDate:Aug 2018The “old” and “new” compliance databases are compared, especially in the context of inferring the number of unsuccessful (“zero”) instances of detecting illegally caught west coast rock lobster. A proposal is made for the proportion of such ...Read more
Author:Brandão, Anabela; Butterworth, DougDate:Aug 2018GLM methods are applied to compliance data (the “old” database) on confiscations (and abandonments) and on policing effort to estimate recent trends in the amount of rock lobster that is poached. Data for the period in 2016 when Operation ...Read more
Author:Mwicigi, Jean; Durholtz, Deon; Glazer, Jean; Butterworth, DougDate:Aug 2018The 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
Author:Nyahodza, LenaDate:06 Mar 2019A presentation on the purpose of sharing OREs at the University of Cape Town via the open access institutional repository (OpenUCT) and the impact these OERs may have on human development through self-directed learning.Read morecb
Author:Claassen, JillDate:06 Mar 2019A presentation on the impact open educational resources (OERs) have in human development to support social justice. The presenter relates how open education has potential to alleviate poverty on the African continent.Read more
Author:Raju, ReggieDate:2019A presentation on the open publishing of open textbooks by UCT academics on UCT Libraries open publishing platform (Open Monograph Press) to alleviate cost of text books for UCT students.Read morecb
Author:de Moor, CarrynDate:2018Presentation on OMP-18 development: selecting an interim Harvest Control Rule for directed sardine held at SWG-PEL Meeting 4thJuly 2018.Read more
