The project on quantifying post-release survival of skate bycatch in the Heard Island and McDonald Islands (HIMI) Patagonian Toothfish longline fishery offers several benefits. Skates are encountered as bycatch in the fishery, and their slow growth and vulnerability to fishing mortality present risk of population decline. The project aims to improve the estimation of total fishing mortality by quantifying the post-release survival of skates using advanced pop-up satellite tag technology. By providing accurate data on post-release survival, the project enhances the accuracy of bycatch limits and informs sustainable yield estimation. It aligns with research and development plans, addressing priority areas such as better assessment approaches, managed fishing impacts and interactions, and bycatch management. The project also supports stock assessments, fisheries management, and policy development. Overall, it improves the understanding of skate bycatch, facilitates environmentally sustainable bycatch management practices, and reduces uncertainty in fisheries management decision-making processes.