Updated 2023 Tristan da Cunha rock lobster assessment

This paper provides details of an updated 2020 assessment of the rock lobster resource at the island of Tristan da Cunha, which takes account of the most recent data available. This assessment takes explicit account of the separate data available from the powerboats, the Edinburgh/Geo Searcher and the annual biomass surveys. Results presented are for rescaled standardised CPUE which takes recent fishing efficiency changes into account. Results are similar to previous assessments. They indicate that the decline in abundance since ~2006 has come to an end, with continuing increases in exploitable and spawning biomass over the 2015+ period. Current spawning biomass relative to pristine is estimated to be very high at 96%.