University of Cape Town
MARAM_Tristan_2023_APR_02 (updated Tristan 2022 CPUE GLM results).pdf (446.56 kB)

Updated (and rescaled) Tristan Island GLM-standardised Jasus tristani lobster Powerboat CPUE to take account of data for the 2022 season

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posted on 2023-09-19, 07:02 authored by Susan HollowaySusan Holloway, Doug ButterworthDoug Butterworth

The Powerboat CPUE series for Tristan Island was last updated in 2022 (MARAM/Tristan/2022/MAY/05), and took data for the 1994-20211 seasons into account. The GLM standardisation incorporated a method whereby the full GLM time series for Tristan Island could be rescaled to take into account the overall fishing efficiency changes as informed by the data on fishermen’s names (available for the 2005-2007 and 2013-2022 seasons only). This document updates this GLM analysis by incorporating data from the most recent 2022 season. An increase in the 2022 CPUE relative to 2021 is evident. The powerboat CPUE for the last two seasons is substantially above the OMP target “Jtar” value.



Department of Mathematics and Applied Mathematics, University of Cape Town