Namibian orange roughy age-structured production model assessments and projections for 2006

 

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dc.contributor.author Brandão, Anabela
dc.contributor.author Butterworth, Doug S
dc.date.accessioned 2016-03-22T09:12:59Z
dc.date.available 2016-03-22T09:12:59Z
dc.date.issued 2006
dc.identifier.citation Brandão, A., & Butterworth, D. S. (2006). Namibian orange roughy age-structured production model assessments and projections for 2006. Namibian Ministry of Fisheries and Marine Resources document: DWFWG/WkShop/Feb06/Doc, 3. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/18146
dc.description.abstract Updated assessments of the four orange roughy aggregations off Namibia, based upon a maximum penalised likelihood approach which uses all available indices of abundance and reflects the proportion of a stock present at the fishing aggregation each year, are presented, and projections under constant catch levels reported. Results suggest that Frankies and Rix are presently at some 60% of their pre-exploitation level, but that Hotspot is perhaps much more depleted at about 10%. Estimates for Johnies range between these extremes, depending on the relative weight accorded survey and CPUE indices of abundance. Overall, medium term sustainable yields would seem to be in the vicinity of 1750 to 2 500 tons. Broadly speaking, MSY estimates are some 5– 30% less than estimated a year previously. However, varying proportions of abundance present at aggregations from year to year would lead to difficulties in making a catch of this size every year. en_ZA
dc.language eng en_ZA
dc.title Namibian orange roughy age-structured production model assessments and projections for 2006 en_ZA
dc.type Working Paper en_ZA
dc.date.updated 2016-03-22T09:08:15Z
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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