Author:Rademeyer, R; Butterworth, Doug S; Plagányi, Éva EDate:2008The 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
Author:Plagányi, Éva EDate:2007Poaching confiscation data have been updated using all data currently available up until the end of May 2007. The data have been reworked in terms of a standard Model year y that is taken to run from October of year y-1 to September of year ...Read more
Author:Plagányi, Éva EDate:2007This document provides preliminary results from fitting the abalone spatial- and agestructured production model (ASPM) to Zones/Subareas A, B, CNP, CP and D in combination (hereafter referred to as the “combined ABCD model”) using the updated ...Read more
Author:Plagányi, Éva EDate:2008A summary is presented of the results obtained from the 2008 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
Author:Plagányi, Éva E; Butterworth, Doug SDate:2005A 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
Author:Plagányi, Éva E; Butterworth, Doug SDate:2006Crawford et al. (2006) present relationships between the breeding success of Robben Island African penguins Spheniscus demersus and the abundances of both anchovy Engraulis encrasicolus and sardine Sardinops sagax. Based on their analysis, ...Read more
Author:Rademeyer, Rebecca A; Butterworth, Doug S; Plagányi, Éva EDate:2008The commercially valuable hake fishery off South Africa consists of two morphologically similar species, the shallow-water Cape hake Merluccius capensis and the deep-water Cape hake M. paradoxus. Because catch-and effort statistics collected ...Read more
Author:Butterworth, Doug S; Plagányi, Éva EDate:2004Aspects of the potential application of multispecies/ecosystem modelling to advise the management of South African fisheries are discussed. In general, reliable predictive ability from such models is likely to be achieved sooner for top ...Read more
Author:Butterworth, Doug S; Rademeyer, Rebecca A; Plagányi, Éva EDate:2005ADAPT-VPA and ASPM assessment methods are applied to the same data set for the Gulf of Maine cod stock to attempt to ascertain the reasons for the rather different results provided by past applications of the two approaches. A number of ...Read more
Author:Plagányi, Éva E; Butterworth, Doug SDate:2008The updated version of the Spatial Multi-species Operating Model (SMOM) of krill-predatorfishery dynamics described in an accompanying paper is conditioned using the WG-SAM set of reference observations for Area 48 (the SAM calendar). Results ...Read more
Author:Plagányi, Éva E; Butterworth, Doug SDate:2004Ecosystem-orientated thinking is increasingly incorporated into fishery management. Given the complexity of ecosystem processes, there is a need to evaluate the tools used to steer this thinking critically. ECOPATH with ECOSIM (EwE), an ...Read more
Author:Plagányi, Éva E; Robinson, WilliamDate:2008This document serves as an updated compilation of all data currently available as inputs to the African penguin spatial model which is to be coupled to the pelagic OMP. The data are presented here together with some comments as to how they ...Read more
Author:Plagányi, Éva EDate:2008A summary is presented of the results obtained from the 2008 Reference-case model and three variants 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- ...Read more
Author:Rademeyer, Rebecca A; Plagányi, Éva E; Butterworth, Doug SDate:2010The 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
Author:Plagányi, Éva E; Butterworth, Doug S; Burgener, MarkusDate:2011Illegal, unregulated and unreported (IUU) fishing is a major problem in many of the world's fisheries. The stocks most severely impacted centre on those characterised by high economic value, such as abalone, as well as long lived and slow ...Read more
Author:Robinson, William M L; Plagányi, Éva E; Butterworth, Doug SDate:2008Given the move towards adopting an ecosystem approach to fisheries in the pelagic sector, the new joint OMP needs to be tested in the light of not only the risk parameters as considered previously, along with catch statistics, but also ...Read more
Author:Somhlaba, S; Brandão, Anabela; Plagányi, Éva E; Butterworth, Doug SDate:2006Earlier GLM analyses of catch per hour data for sardine and anchovy to determine
observer effects have suggested statistically significant increases in this catch rate
with observers on the vessels over January-to June for the sardine ...Read more