Indian Ocean yellowfin workplan (2019-2020)

In 2018, the IOTC Scientific Committee (SC) adopted a workplan to reduce the uncertainties of the stock assessment of Indian Ocean yellowfin tuna. In 2019, several tasks of the workplan were addressed and reported to the 21^st Working Party of Tropical Tunas (WPTT). However, the WPTT agreed that the progress on the workplan was insufficient to provide new management advice in 2019. The main reasons for this were the complexity of the endeavour, the lack of agreement on key model aspects and time constraints for a thorough examination of the new model during the WPTT meeting. During 2020, works with the yellowfin model have continued. In particular, on clarifying the treatment done to tagging data, on simplifying the model configuration and developing a new approach to produce a new reference case and on a weighting scheme for the uncertainty grid agreed in 2019.