The Powerboat CPUE series for Tristan was last updated in 2015 (MARAM/Tristan/2015/MAY/06) and took data for the 1994-20141 seasons into account. A GLM with year and month as fixed effects was applied to these data as has been done in the past. Data on both the areas fished and the fishermen’s names are now available for recent seasons. A method is proposed whereby the full GLM for Tristan can be rescaled to take into account the overall fishing efficiency changes informed by these new data. The inclusion of the fishing efficiency changes results in a slightly less pessimistic CPUE trend over recent seasons.
Reference:
Johnston, S.J. and Butterworth, D.S. 2016. Rescaled Tristan GLM-standardised lobster CPUE to take account of fishing efficiency changes. MARAM document: MARAM/TRISTAN/2016/MAR/05: 12pp.
Johnston, S., & Butterworth, D. (2016). Rescaled Tristan GLM-Standardised Lobster CPUE to take account of fishing efficiency changes University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group. Retrieved from http://hdl.handle.net/11427/22532
Johnston, Susan, and Doug Butterworth Rescaled Tristan GLM-Standardised Lobster CPUE to take account of fishing efficiency changes. University of Cape Town ,Faculty of Science ,Marine Resource Assessment and Management Group, 2016. http://hdl.handle.net/11427/22532
Johnston S, Butterworth D. Rescaled Tristan GLM-Standardised Lobster CPUE to take account of fishing efficiency changes. 2016 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/22532
