Study to assess the robustness of mixed fisheries scenario assumptions

This project supported the ICES mixed-fisheries assessment process, investigating the robustness of different assumptions made during mixed-fisheries modelling. Working together with mixed-fishery expert partners from across Europe, analysis focused on three broad case study areas: the North Sea, Celtic Sea, and Bay of Biscay. We explored the impacts and sensitivity of current assessment method assumptions through quantitative analysis of areas including, but not limited to technical interactions within the fishing fleets and fisheries, input and control setting assumptions, and the importance of the types of species included at the stock level. Each of which could lead to situations where mixed-fisheries scenarios indicate the need for lesser or greater reductions in fishing opportunities than required in reality. This can lead to stock under-utilisation and risk undermining the utility of mixed-fisheries scenarios in setting TACs.