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Browsing by Author "de Moor, Carryn L"

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The 2004 re-assessment of the South African sardine and anchovy populations to take account of revisions to earlier data and recent record abundances

Author: de Moor, Carryn L ; Butterworth, Doug S Date: 2009 Hydroacoustic surveys off the coast of South Africa over the early years of the 21st century indicated that both the sardine Sardinops sagax and anchovy Engraulis encrasicolus populations had simultaneously reached record abundances. The South ... 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
Alternative hypotheses of two mixing stocks of South African sardine: initial testing

Author: de Moor, Carryn L ; Butterworth, Doug S ; van der Lingen, C D ; Coetzee, J C Date: 2014 A new assessment of sardine based on data from 1984 to 2014 is planned to commence in a few months’ time. This assessment will eventually form the operating model which will be used to project the sardine population forward in time under ... Read more
An alternative two mixing stock hypothesis for South African sardine

Author: de Moor, Carryn L Date: Oct 2016 The results of the two mixing stock hypothesis for South African sardine presented in de Moor and Butterworth (2016) assumed recruitment to each coastal management unit was dependent only on the spawner biomass (SSB) of that coastal management ... Read more c b
Are South African administrative law procedures adequate for the evaluation of issues resting on scientific analyses

Author: Butterworth, Doug S ; de Oliveira, Jose A ; de Moor, Carryn L Date: 2012 This article traces, from a critical perspective, the way in which the various courts that were seized of the matter reviewed the scientific approaches to the allocation of fishing quotas for sardine and anchovy in Foodcorp (Pty) Ltd v Deputy ... Read more
Assessment of the South African anchovy resource using data from 1984 - 2015: results at the posterior mode

Author: de Moor, Carryn L Date: Oct 2016 The operating model (OM) for the South African anchovy resource has been updated from that used to develop OMP-14 given four more years of data. The model has been altered from previous assessments to now fit directly to length frequency data, ... Read more
Excluding survey estimates of recruitment on the South Coast from the two mixing stock hypothesis for South African sardine

Author: de Moor, Carryn L Date: Nov 2016 The international panel from the annual Stock Assessment Workshops have recommended that the sensitivity of the two mixing stock hypothesis to the inclusion of hydroacoustic survey estimates of recruitment on the South Coast be tested. This ... Read more
Final Anchovy and Sardine TACs and TABs for 2017, Using OMP-14

Author: de Moor, Carryn L Date: 2017 As the November survey estimate of sardine abundance was less than 300 000t, the Exceptional Circumstances rule was used resulting in an initial directed >14cm sardine TAC being recommended at the beginning of the year. Read more
Fisheries management under climate and environmental uncertainty: control rules and performance simulation

Author: Punt, Andre´ E ; A’mar, Teresa ; Bond, Nicholas A ; Butterworth, Doug S ; de Moor, Carryn L ; De Oliveira, Jose´ A A ; Haltuch, Melissa A ; Hollowed, Anne B ; Szuwalski, Cody Date: 2014 The ability of management strategies to achieve the fishery management goals are impacted by environmental variation and, therefore, also by global climate change. Management strategies can be modified to use environmental data using the ... Read more
Further work on a risk analysis of the impact of harvesting sardine on the west coast of South Africa

Author: de Moor, Carryn L Date: Aug 2016 de Moor and Butterworth (2016a) undertook an initial risk analysis to consider the risk to the sardine resource for the 2016 season, in terms of the west coast harvest proportion. This analysis was to assist in discussions regarding the ... Read more
OMP-13: Initial Results Assuming a Two Sardine Stock Hypothesis

Author: de Moor, Carryn L ; Butterworth, Doug S Date: 2013 Further work in the development of OMP-13 has continued with modifications to the documentation and code, mostly to allow for a generalisation towards one or two sardine stocks and one or two directed sardine TACs (de Moor and Butterworth ... Read more
The present agreed hypothesis for South African sardine stock structure

Author: Butterworth, Doug S ; van der Lingen, C D ; Coetzee, J ; de Moor, Carryn L Date: Nov 2016 Read more
Progress in checking the code used to condition the operating models for the South African hake resource to be used in OMP-2010 testing

Author: de Moor, Carryn L ; Rademeyer, Rebecca A Date: 2010 The code used to condition these Operating Models, the results for which have been reported in documents such as MCM/2010/FEB/SWG-DEM/05, has been subjected to careful independent checking by the first author. This checking has focused on ... Read more
Progress report on recommendations from the International review panel report for the 2013 International Fisheries Stock assessment workshop:sardine

Author: de Moor, Carryn L ; Butterworth, Doug S ; Coetzee, Janet C ; van der Lingen, Carl D Date: 2014 The international review panel report (MARAM/IWS/DEC13/General/4 Final Report) contained the following recommendations pertinent to sardine in response to key questions put to them at the annual stock assessment review meeting held at UCT ... Read more
The quantitative use of parasite data in multistock modelling of South African sardine (Sardinops sagax) 1

Author: de Moor, Carryn L ; Butterworth, Doug S ; van der Lingen, Carl D Date: 2017 Differences in parasite infection have previously been used to distinguish between fish stocks. We demonstrate a novel use of parasite prevalence-by-length data to inform quantitatively on stock mixing. An initial two mixing stock hypothesis ... Read more
Response to MCM/2010/PEL/48: Suggestions for improving the penguin modeling framework

Author: Butterworth, Doug S ; Robinson, William M L ; Plagányi, Éva E ; de Moor, Carryn L Date: 2010 As general background, it should be noted that the brief for document MCM/2010/SWG-PEL/35 was to combine into a single convenient reference a number of documents that contributed to the discussion and decision on the issue of possibly amending ... Read more
The simulation testing framework used during the development of OMP-13

Author: de Moor, Carryn L ; Butterworth, Doug S Date: Nov 2012 This document details the framework used to simulation test candidate MPs during the development of OMP-13. A summary of assumptions made in this simulation testing framework are listed below, with yellow highlights indicating updates since ... Read more c b
Testing robustness of the two mixing stock hypothesis for South African sardine to parasite prevalence data between 20 and 22 degrees

Author: de Moor, Carryn L Date: Dec 2016 The baseline two mixing stock assessment of South African sardine has been conditioned on parasite prevalence data on the south coast east of 22◦E only (Dunn et al. 2015, de Moor and Butterworth 2016). Data between 20 and 22◦E were excluded ... Read more
When would a survey estimate be considered "appreciably outside the bounds predicted in the OMP testing"

Author: de Moor, Carryn L ; Butterworth, Doug S Date: 2009 Anon. (2009), outlining the procedures for deviating from or initiating an early review of the pelagic OMP, was discussed at the Scientific Working Group (Pelagic) on 26th February 2009. The document lists examples as to what might constitute ... Read more