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 1997-2012

 

Show simple item record

dc.contributor.author Brandão, Anabela
dc.contributor.author Butterworth, Doug S
dc.date.accessioned 2016-03-15T09:48:14Z
dc.date.available 2016-03-15T09:48:14Z
dc.date.issued 2012
dc.identifier.citation Brandão, A., & Butterworth, D. S. (2012). 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/11427/17801
dc.description.abstract The previous GLMM standardisation approach for PEI toothfish (Spanish) longline CPUE data is extended to include data for the 2011-2012 seasons and the same approach is applied to trotline CPUE data for the 2008–2012 period. CPUE data from a research program carried out in 2012 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 for 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 a drop of about 44% in standardised CPUE in 2012 compared to the immediately preceding years; however it must be noted that the data in 2012 is available only until August. en_ZA
dc.language eng en_ZA
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 1997-2012 en_ZA
dc.type Working Paper en_ZA
dc.date.updated 2016-03-15T09:46:37Z
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


Files in this item

This item appears in the following Collection(s)

Show simple item record