MARAM_Tristan_2021_JUL_11 (Revised Gough assessment updates 2021).pdf (1.07 MB)
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Revised 2021 assessment of Jasus tristani rock lobster at Gough island

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posted on 20.07.2021, 12:26 authored by Susan HollowaySusan Holloway, Doug ButterworthDoug Butterworth
This paper provides a revised updated assessment of the Jasus tristani rock lobster resource at Gough island. This revision constrains the sigma values of the commercial and biomass survey indices to be ≥0.15. It also now takes updated standardised CPUE and discard % data from the commercial fishery for the 2020 season as well as the final catch figure for 2020 into account. This assessment was last fully updated in 2018. This revised updated 2021 assessment has produced somewhat more optimistic results (compared with the 2018 assessment) with respect to current spawning biomass. Current resource abundance is estimated to be 86% of pristine – a very healthy state. This updated assessment model will function as the underlying baseline operating model in the development of a new 2021 OMP.



Department of Mathematics and Applied Mathematics, University of Cape Town