The ICES Working Group on Mixed Fisheries Advice (WGMIXFISH-ADVICE) produces mixed fisheries forecasts for the Bay of Biscay, Celtic Seas, Iberian Waters, Irish Sea, and North Sea. These forecasts highlight the potential implications of single-stock (total allowable catch and ef-fort) management on the catches of multiple stocks caught together in mixed fisheries. Mixed fisheries models consider past fishing patterns and catchability of the different fleets, and the catch advice produced by the single-stock advice groups, to provide quantitative forecasts of over- and underexploitation of the different stocks given mixed fishery interactions. The mixed fisheries forecasts were produced using the “FCube” (Fleet and Fishery Forecasts) methodology for the Celtic Sea and Irish Sea, and the “FLBEIA” (Bio-Economic Impact Assessment using FLR) methodology for the Bay of Biscay, Iberian Waters, and North Sea.
The Bay of Biscay mixed fisheries projections consider the single-species advice of 13 stocks (ank.27.78abd, bss.27.8ab, hke.27.3a46-8abd, hom.27.2a3a4a5b6a7a-ce-k8, mac.27.nea, meg.27.7b-k8abd, mon.27.78abd, nep.fu.2324, pol.27.89a, sdv.27.nea, sol.27.8ab, whb.27.1-91214, and whg.27.89a). Given the single-stock catch advice for 2025, the most limiting stock for demer-sal fisheries in the Bay of Biscay is pollack, whose stock share is first reached for eight of 21 defined fleets. The least limiting stock is black-bellied anglerfish (seven of 21 fleets).
The Celtic Sea mixed fisheries projections consider the single-species advice for 15 stocks (cod.27.7e-k, had.27.7b-k, whg.27.7b-ce-k, nep.fu.16, 17, 19, 20–21, 22, and outside FUs, sol.27.7e, sol.27.7fg, mon.27.78abd, ank.27.78abd, meg.27.7b-k8abd, and hke.27.3a46-8abd). Given the sin-gle-stock catch advice for 2025, the most limiting stocks for demersal fisheries in the Celtic Sea are cod and whiting, with 30 of 33 defined fleets choked by these two stocks due to the zero-catch advice, and the fact that almost all fisheries operating with demersal gears catch them. The least limiting stock is black-bellied anglerfish (16 fleets), followed by hake (nine fleets), Norway lob-ster in FU 20–21 (seven fleets) and white anglerfish (one fleet).
The Iberian waters mixed fisheries projections consider the single-species advice for 5 stocks (ank.27.8c9a, hke.27.8c9a, lbd.27.8c9a, meg.27.8c9a and mon.27.8c9a). Given the single-stock catch advice for 2025, the most limiting stock for demersal fisheries in the Iberian Waters is hake, with all 11 defined fleets reaching their hake quota with a lower effort than for the other stocks. The least limiting stock is black-bellied anglerfish (10 of 11 fleets).
The Irish Sea mixed fisheries projections consider the single-species advice for 7 stocks (cod.27.7a, had.27.7a, ple.27.7a, sol.27.7a, whg.27.7a, nep.fu.14, and 15). Given the single-stock catch advice for 2025, the most limiting stocks for demersal fisheries in the Irish Sea are whiting and cod, with all 12 defined fleets choked by these two stocks due to the zero-catch advice, and the fact that 11 of 12 fleets catch them both. The least limiting stock is haddock (nine of 12 fleets).
The North Sea mixed fisheries projections consider the single-species advice for 20 stocks (bll.27.3a47de, cod.27.47d20, had.27.46a20, ple.27.420, ple.27.7d, pok.27.3a46, sol.27.7d, tur 27.4, whg.27.47d, wit.27.3a47d, nep.fu.5, 6, 7, 8, 9, 10, 32, 33, 34, and 4 outFU). Given the single-stock catch advice for 2025, the most limiting stock for demersal fisheries in the North Sea is cod, whose stock share is first reached for 23 of 37 defined fleets. The least limiting stock is whiting (35 of 37 fleets).
Additional work included contributions to four technical requests.