| 6. |
- Orio, Alessandro
(author)
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Working Group on Mixed Fisheries Advice Methodology (WGMIXFISH-METHODS)
- 2023
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Reports (other academic/artistic)abstract
- The ICES Working Group on Mixed Fisheries Methodology (WGMIXFISH-METHODS) met to progress work on the improvement and development of the mixed fisheries considerations.The work addressed in 2023 included improving workflows for the advice process, presenting methodological advances, developing new ecoregions and responding to issues encountered during WGMIXFISH-ADVICE 2022. Additionally, key developments arising from the Second Scoping Workshop (WKMIXFISH2) were discussed.The primary development affecting data workflows related to developing a proactive response to the planned introduction of RDBES for stock assessment purposes. The introduction of RDBES will affect WGMIXFISH by replacing InterCatch and the current data call as a data source. The data access requirements and steps needed to transfer workflows to using RDBES as a data source were outlined and aligned with the timetable for the phased introduction of RDBES.Several methodological advances were presented, many of which derive from either the STARMIXFISH project, the outcomes of the Second Scoping Workshop (WKMIXFISH2) or have been identified as a priority by WGMIXFISH. These analyses explored sensitivity to model assumptions, incorporating uncertainty in model parameters and novel methods for using spatial data to define métiers. Additionally, the application of mixed fisheries methods in externally developed models of the Bay of Biscay and Western Mediterranean were presented.Significant improvements were progressed for the Iberian Waters and North Sea models. For the Iberian Waters, the potential for adding pelagic stocks such as mackerel and blue whiting to the model was explored with further work planned in the near future. In the North Sea, developments were made to the fleet data processing workflow to improve consistency with other ecoregions and plans were made to incorporate North Sea brill into the model following its recent move to a category 2 assessment. Additionally, work was conducted to explore feasible options for incorporating the new Northern Shelf cod assessment, which consists of 3 sub-stocks, following the recent benchmark of North Sea cod.Finally, mixed fisheries analyses for the Baltic Sea were initiated and involved a review of existing data available to WGMIXFISH and the evaluation of alternative data sources. Planned work in this region in 2023 aims to provide an analysis of catch compositions for the ecoregion which will be presented in the Baltic Sea fisheries overview.
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| 7. |
- Orio, Alessandro
(author)
-
Working Group on Mixed Fisheries Advice (WGMIXFISH-ADVICE)
- 2023
-
Reports (other academic/artistic)abstract
- The ICES Working Group on Mixed Fisheries Advice (WGMIXFISH-ADVICE) held a hybrid meeting to produce mixed fisheries forecasts for the Bay of Biscay, Celtic Sea, Iberian waters, Irish Sea and the North Sea. 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 considers past fishing patterns and catchability of the different fleets, and the TAC advice produced by the single-stock advice groups, to provide a quantitative forecast 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 the 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.27.2a4a5b6a7a-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 2024, the most limiting stock for demersal fisheries in the Bay of Biscay is horse mackerel, due to the zero-catch advice and that almost all fleets within the mixed fishery catch this stock. The least limiting stock is white anglerfish (7 of 21 fleets). However, if horse mackerel were to be excluded as a restrictive stock due to the small contribution made by the demersal fleets to the total stock landings, the most limiting stock would be pollack whose quota is first reached for 7 of 21 defined 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 single-stock catch advice for 2024, the most limiting stocks for demersal fisheries in the Celtic Sea are cod and whiting, choking 27 of 35 fleets, with 3 further fleets choked by cod alone. This is due to the zero catch advice for cod and whiting, and almost all fisheries operating with demersal gears that catch these stocks. The least limiting stock is Norway lobster in FU 2021 (18 fleets) followed by black-bellied anglerfish (16 fleets).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 2024, the most limiting stock for demersal fisheries in the Iberian waters is hake, whose advised catch for 2024 is first reached for all 11 defined fleets. 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 2024, the most limiting stocks for demersal fisheries in the Irish Sea are whiting, choking all of the 12 fleets, and sole and cod chocking 11 of 12 fleets. The least limiting stock is plaice (11 of 12 fleets).The North Sea mixed fisheries projections consider the single-species advice for 21 stocks (bll.27.3a47de, cod.27.47d20, had.27.46a20, ple.27.420, ple.27.7d, pok.27.3a46, sol.27.4, 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 2024, the most limiting stock for demersal fisheries in the North Sea is cod, whose advised catch for 2024 is first reached for 35 of 43 defined fleets. The least limiting stock is whiting (36 of 43 fleets).Additional work included contributions to six technical requests.
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