Obtaining a standardised CPUE series for toothfish (Dissostichus eleginoides) in the Prince Edward islands EEZ calibrated to incorporate both longline and trotline data over the period 1997-2013

 

Show simple item record

dc.contributor.author Brandão, Anabela
dc.contributor.author Butterworth, Doug S
dc.date.accessioned 2016-03-29T08:25:44Z
dc.date.available 2016-03-29T08:25:44Z
dc.date.issued 2013
dc.identifier.citation Brandão, A., & Butterworth, D. S. (2013). Obtaining a standardised CPUE series for toothfish (Dissostichus eleginoides) in the Prince Edward Islands EEZ calibrated to incorporate both longline and trotline data over the period 1997-2013. DAFF Branch Fisheries document. FISHERIES. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/18350
dc.description.abstract The previous GLMM standardisation approach for PEI toothfish (Spanish) longline CPUE data is extended to include data for the 2012 and 2013 seasons and the same approach is applied to trotline CPUE data for the 2008–2013 period. CPUE data from a research program carried out in 2012 and 2013 in which longline and trotline sets were paired to within three nautical miles and a period of two weeks is analysed to obtain a calibration factor between longlines and trotlines. A model is then fitted to combine the two individual standardised CPUE series and the calibration factor to obtain a “calibrated” longline CPUE series (incorporating both longline and trotline information) and an estimate of the calibration factor. This indicates an increase of about 18% in standardised CPUE in 2013 compared to the preceding year, but this remains about 20% below the 2011 value. However it should be noted that data for 2013 are available only until July. en_ZA
dc.description.uri http://www.mth.uct.ac.za/maram/pub/2013/FISHERIES_2013_OCT_SWG-DEM_57.pdf
dc.language eng en_ZA
dc.subject.other Toothfish
dc.subject.other Dissostichus eleginoides
dc.subject.other standardised CPUE series
dc.title Obtaining a standardised CPUE series for toothfish (Dissostichus eleginoides) in the Prince Edward islands EEZ calibrated to incorporate both longline and trotline data over the period 1997-2013 en_ZA
dc.type Working Paper en_ZA
dc.date.updated 2016-03-29T08:23:54Z
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


Files in this item

This item appears in the following Collection(s)

Show simple item record