Progress report on collaborative research for otolith chemistry of Antarctic toothfish Dissostichus mawsoni in the Southern Ocean

Otolith chemical analysis is one of important and useful approaches to reveal the stock structure and connectivity of Dissostichus mawsoni in the Southern Ocean. Recalling the suggestion from WG-FSA 2018 about the international collaboration on otolith microchemistry of D. mawsoi, this progress report summarized the update of this work. The result indicated that the heterogeneity in stock structure of D. mawsoni occurs between Subareas 88.1 and 48.6. Samples from Subareas 48.4, 48.5, Subarea 88.3, Divisions 58.4.1, 58.4.2 and 58.4.3, and SPRFMO area are encouraged to be collected and included into this collaborative project.