This project will contribute to the 2026 assessment and build on the work undertaken by Krusic-Golub K. and Robertson S.G. (2020), Brouwer et al. (2020), and Brouwer et al. (2021) to develop growth and maturity curves for alfonsino (Beryx splendens) in the Western and Eastern stocks of the Southern Indian Ocean, using otoliths collected and held by the Cook Islands and Japan. The results from the bomb radiocarbon ageing project (SER2022-BYS2) and the 2024 development of a new ageing protocol should be used.