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Inclusion of skipper effect in the GLM standardisation of the CPUE abundance indices for orange roughy off Namibia

Authors: Brandão, Anabela; Butterworth, Doug S;

Inclusion of skipper effect in the GLM standardisation of the CPUE abundance indices for orange roughy off Namibia

Abstract

Various GLM analyses are used to standardise the CPUE data for Namibian orange roughy to investigate the impact of using information on skippers rather than on vessels. The inclusion in the GLMs of a skipper factor rather than a vessel factor results in lower CPUE indices for the most recent years. Classifying skippers as experienced or inexperienced in orange roughy fishing does not have an appreciable impact on standardised CPUE trends. However, classifying individual initially inexperienced skippers as experienced after their first year in the fishery results in lower CPUE indices, in particular for the last four years. In broad terms, there is not a clear difference between skippers pre-classified as experienced or inexperienced.

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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