Obtaining a multiplicative bias calibration factor between the Africana with the old and the new trawl gear

 

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dc.contributor.author Brandão, Anabela
dc.contributor.author Rademeyer, Rebecca A
dc.contributor.author Butterworth, Doug S
dc.date.accessioned 2016-04-06T11:36:00Z
dc.date.available 2016-04-06T11:36:00Z
dc.date.issued 2004
dc.identifier.citation Brandão, A., Rademeyer, R. A., & Butterworth, D. S. (2004). Obtaining a multiplicative bias calibration factor between the Africana with the old and the new trawl gear. MARAM: University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/18660
dc.description.abstract The survey vessel Africana has been used for the demersal surveys on the south and west coasts of South Africa since 1984. In June 2003, the fishing gear used on this vessel was changed and a different value for the multiplicative bias factor q needs to be applied to the surveys conducted with the new gear in the assessments of the South African hake resource. Calibration experiments have been conducted between the Africana with the old gear (hereafter referred to as the “old Africana”) and the Nansen, and between the Africana with the new gear (“new Africana”) and the Nansen in order to provide a basis to relate the multiplicative biases of the Africana with the two types of gear ( qold and qnew ). A Generalised Linear Model (GLM) analysis assuming a negative binomial distribution for the catches made in the experiments has been applied to provide the calibration factor.
dc.language eng en_ZA
dc.title Obtaining a multiplicative bias calibration factor between the Africana with the old and the new trawl gear en_ZA
dc.type Working Paper en_ZA
dc.date.updated 2016-04-06T11:34:03Z
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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