Illegal and unreported fishing on abalone—Quantifying the extent using a fully integrated assessment model

 

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dc.contributor.author Plagányi, Éva E
dc.contributor.author Butterworth, Doug
dc.contributor.author Burgener, Markus
dc.date.accessioned 2016-03-14T09:14:55Z
dc.date.available 2016-03-14T09:14:55Z
dc.date.issued 2011
dc.identifier http://dx.doi.org/10.1016/j.fishres.2010.11.005
dc.identifier.citation Plagányi, É., Butterworth, D., & Burgener, M. (2011). Illegal and unreported fishing on abalone—Quantifying the extent using a fully integrated assessment model. Fisheries Research, 107(1), 221-232. en_ZA
dc.identifier.issn 0165-7836 en_ZA
dc.identifier.uri http://hdl.handle.net/11427/17755
dc.identifier.uri http://www.sciencedirect.com/science/article/pii/S0165783610002882
dc.description.abstract Illegal, 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 growing species such as Patagonian toothfish (Dissostichus eleginoides). Effective management of these stocks as well as assessment of the impacts of IUU fishing on the resources is impeded by the technical difficulties associated with determining the magnitude of the IUU catches. The South African abalone Haliotis midae fishery rates as an extreme example of extraordinarily high levels of illegal and unreported (IU) catch. To assess the level and trends in IU catches, we used a combination of approaches that included collation of confiscation records from law enforcement, development of a novel index (the confiscations per unit policing effort—CPUPE), estimation of illegal catches using a spatial and age-structured assessment model, and cross-checking of model outputs through comparison with trade data on abalone imports in destination countries. The model-predicted 2008 IU estimate was 860 tonnes, more than 10 times the total allowable catch (TAC) for that year, and implied that, on average, 14% of all IU catches are confiscated. Associated management responses included the listing of H. midae on Appendix III of CITES (the Convention on International Trade in Endangered Species of Wild Fauna and Flora), and a temporary closure of the commercial fishery. We summarise both technical and management lessons to be learnt from this integrated approach to assess and verify the magnitude of IU fishing. en_ZA
dc.language eng en_ZA
dc.publisher Elsevier en_ZA
dc.source Fisheries Research en_ZA
dc.source.uri http://www.sciencedirect.com/science/journal/01657836/107/1
dc.subject.other Illegal catch
dc.subject.other Unreported catch
dc.subject.other Unregulated
dc.subject.other IUU
dc.subject.other Abalone
dc.subject.other Age-structured production model
dc.subject.other Poaching
dc.title Illegal and unreported fishing on abalone—Quantifying the extent using a fully integrated assessment model en_ZA
dc.type Journal Article en_ZA
dc.date.updated 2016-03-14T08:59:11Z
uct.type.publication Research en_ZA
uct.type.resource Article en_ZA
uct.subject.keywords Illegal catch; Unreported catch; Unregulated; IUU; Abalone; Age-structured production model; Poaching en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Marine Resource Assessment and Management Group en_ZA


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