Updated investigation of the orange roughy south of Johnies given further data

 

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dc.contributor.author Brandão, Anabela
dc.contributor.author Butterworth, Doug S
dc.date.accessioned 2016-03-22T11:01:11Z
dc.date.available 2016-03-22T11:01:11Z
dc.date.issued 2006
dc.identifier.citation Brandão, A., & Butterworth, D. S. (2006). Updated investigation of the orange roughy south of Johnies given further data. Namibian Ministry of Fisheries and Marine Resources document: DWFWG/WkShop/Feb06/Doc, 6(0). en_ZA
dc.identifier.uri http://hdl.handle.net/11427/18166
dc.description.abstract The biomass of orange roughy for the region south of Johnies is estimated coarsely by treating the product of standardised CPUE and area as an index of abundance, and then calibrating against population model based estimates of abundance from the recognised aggregations. For the intermittent aggregation model estimates of abundance, for Frankies and Rix, this suggests that cumulative catches from South Johnies would not have appreciably reduced abundance in the region. However, one of two model options to estimate the Johnies abundance yields more pessimistic results, and the decline in the standardised CPUE for the region over the last three years also raises concerns. Results from the ASPM assessment of the Johnies and South Johnies aggregations combined suggest a resource at 48% of its pre-exploitation level. Projections based upon this ASPM suggest that the medium term sustainable yield for the combined aggregation is in the vicinity of 750 t. en_ZA
dc.language eng en_ZA
dc.title Updated investigation of the orange roughy south of Johnies given further data en_ZA
dc.type Working Paper en_ZA
dc.date.updated 2016-03-22T10:59:34Z
uct.type.publication Research en_ZA
uct.type.resource Research paper 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
uct.type.filetype Text
uct.type.filetype Image


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