Tristan Group Biomass Survey results of Jasus tristani including data from the 2023 season

This paper reports the updated biomass indices (to include the 20231 season) obtained from the annual biomass survey at each island. The Tristan biomass has shown a steady increase since 2015. Survey results at Inaccessible and Gough have been steady over recent years with positive levels for the last three seasons. The 2023 Nightingale survey has improved since the rather low value reported in 2022. The percentage of females in the catch at Gough (around 25-35%) is much higher that at the other three islands (around 5-15%). The high percent females observed in the survey at Tristan in 2021 has not occurred again, with the 2022 and 2023 values back within the normal range. The Nightingale index has improved this season.