Working Group on Mixed Fisheries Advice (WGMIXFISH-ADVICE; outputs from 2019 meeting).

• Main Authors: Aristegui-Ezquibela, Mikel, Brunel, Thomas, Cole, Harriet, Garcia, Dorleta, Moore, Claire, Muench, Angela, Pawlowski, Lionel, Robert, Marianne, Sampedro, Paz, Sys, Klaas, Taylor, Marc, Trijoulet, Vanessa, Vermard, Youen
• Format: Book
• Language: English
• Published: International Council for the Exploration of the Sea (ICES) 2020
• Subjects: /dk/atira/pure/sustainabledevelopmentgoals/life_below_water; name=SDG 14 - Life Below Water; Norway; Tac; Turbot
• Online Access: https://orbit.dtu.dk/en/publications/fb90976f-ddb5-469f-94f1-54e459360fad; https://doi.org/10.17895/ices.pub.7508; https://backend.orbit.dtu.dk/ws/files/234638032/WGMIXFISH_ADVICE_2019.pdf

The ICES Working Group on Mixed Fisheries Advice (WGMIXFISH-ADVICE) chaired by Claire Moore, Ireland, met at ICES headquarters in Copenhagen, Denmark, 28 October–1 November 2019 to produce mixed fisheries forecasts for the North Sea, Celtic Sea, and Iberian waters Mixed fisheries advice highlights the potential implications of single-stock (total allowable catch and effort) management on the catches of multiple stocks caught together in mixed fisheries. It takes into account past fishing patterns and catchability of the different fleets, and the TAC advice produced by the single-stock advice groups for 2019 to provide quantitative forecast of over- and under-exploitation of the different stocks given mixed fishery interactions. Forecasts were based on the “FCube” (Fleet and Fishery Forecasts) methodology for the Celtic Sea and North Sea, and on the “FLBEIA” (Fisheries Library Bio-Economic Impact Assessment) methodology for the Iberian Waters—with a range of potential management scenarios relevant for the specific regional fisheries. The North Sea demersal mixed fisheries projections consider the single-species advice for cod (cod.27.47d20), haddock (had.27.46a20), whiting (whg.27.47d), saithe (pok.27.3a46), plaice (ple.27.420 and ple.27.7d), sole (sol.27.4), turbot (tur 27.4), and Norway lobster Nephrops norvegicus (functional units [FUs] 5–10, 32, 33, 34, and 4 outFU). The most limiting TAC in 2020 will be the TAC for cod for particular fleets (“cod-ns” scenario). The “min” scenario gives a 14% higher catch of cod compared to the “cod-ns” scenario, due to the relaxing of the constraint on a stock where the country is not assumed to be limited for that stock, but the model does not take into account quota reallocation between fleets. Substantial overshoot of TACs can occur under other scenarios (e.g. “max” scenario). This “range” scenario suggests that the potential for mixed fisheries mismatch would be lowered with a 2020 TAC in the lower part of the FMSY range for North Sea plaice and North Sea saithe, and at ...