Updated GLM standardised CPUE abundance indices for orange roughy for known aggregations off Namibia from 1994 to 2006

 

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dc.contributor.author Brandão, Anabela
dc.contributor.author Butterworth, Doug S
dc.date.accessioned 2016-03-29T12:57:12Z
dc.date.available 2016-03-29T12:57:12Z
dc.date.issued 2007
dc.identifier.citation Brandão, A., & Butterworth, D. S. (2007). Updated GLM standardised CPUE abundance indices for orange roughy for known aggregations off Namibia from 1994 to 2006. Namibian Ministry of Fisheries and Marine Resources document DWFWG/WkShop/Feb06/Doc, 2. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/18358
dc.description.abstract GLM analyses are used to standardise the CPUE data for Namibian orange roughy in a manner that deals with tows that record zero catch of orange roughy. The possibility of there being a “learning” period of lower CPUE for a new vessel when it enters the fishery is taken into account. Further, to allow for areal expansion of the fishery at each aggregation, sub-aggregations are defined and CPUE trends estimated separately for each. The “zero” method for combining the results for the various sub-aggregations to provide a single index for an aggregation is applied. The standardised CPUE value for 2005 (i.e. the July 2004 – June 2005 fishing year) for Johnies is the highest it has been in the last six years. The 2006 index is down from the previous year. For Frankies the 2006 index is up from that for 2004 (no 2005 index is available). No indices for Hotspot and Rix are available for the last two years. en_ZA
dc.language eng en_ZA
dc.title Updated GLM standardised CPUE abundance indices for orange roughy for known aggregations off Namibia from 1994 to 2006 en_ZA
dc.type Working Paper en_ZA
dc.date.updated 2016-03-29T12:54:13Z
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
uct.type.filetype Text
uct.type.filetype Image


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