Refined trends in poaching for West Coast rock lobster using information from the “new” database for the period 2012 to 2017

Brandão, Anabela; Butterworth, Doug S

Refined trends in poaching for West Coast rock lobster using information from the “new” database for the period 2012 to 2017

Report

2018-08

Abstract

GLM methods are applied to the “new” compliance database in which policing effort is linked to confiscations taken as well as to the “old” compliance database on confiscations (and abandonments) and on policing effort (but restricting the analyses to policing effort types that are common with the “new” database) to estimate recent trends in the amount of rock lobster that is poached. GLM methods are also applied to this “old” database, but estimates of relative effort efficiencies for different effort types obtained from the “new” database (and adjusted to account for inspections with zero confiscations which are not recorded in the “new” database) are used to link effort to the number of confiscations to provide a refined “old”-linked time series for the level of poaching. Because the number of data in the “new” database is so much less (only some 0.5%) than in the “old” database, it is recommended that the “new” database analyses be used only to provide estimates of relative efficiency of different effort types, and that the “old”-linked series serve as the basis for the assumptions concerning poaching needed for future assessments. These series suggest generally higher levels of poaching subsequent to 2008/9 than did earlier analyses.

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