Browsing by Author "Kelly, Ruth"
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- Scoping workshop 3 on next generation of mixed fisheries advice (WKMIXFISH3)Publication . Andersen, Michael; Bourke, Elizabeth; Cole, Harriet; Cook, Robert; Danby, Rufus; Dolder, Paul; Ferraro, Marta; Garcia, Dorleta; Green, Phil; Grossmann, Jenni; Kelly, Ruth; Lamon, Luca; Maginnis, Neil; Marcher, Claire; Moore, Claire; Muench, Angela; Polonio, Virginia; Rodmel, Dale; Rogers, Chloe; Sandel, Jane; Schou, Mogens; Seixas, Sónia; Sulanke, Erik; Sys, Klaas; Taylor, Marc; Tsangarides, Christian; Vermard, YouenWKMIXFISH are a series of workshops bringing together scientists, advice recipients, and stakeholders to identify future research and advisory priorities for mixed fisheries science. The third scoping workshop on the next generation of mixed fisheries advice (WKMIXFISH3) met to review changes to mixed fisheries considerations and progress on method development since the last workshop in March 2023. The workshop focused on three areas of development. First, it reviewed changes and clarifications to mixed fisheries considerations that were incorporated to improve communication around the purpose of and assumptions in the advice. Second, it reviewed the substantial methodological development that has been undertaken by WGMIXFISH-METHODS and EU and UK research projects. The focus of this work was to address an EU/UK joint request to ICES on mixed fisheries science. Third, it discussed the outcome of a workshop on fleet and métier definitions (WKMIXFLEET) that took place the preceding two days. Methodological developments included evaluation of uncertainty in mixed fisheries models, analyses of sensitivity to model assumptions, including fleet and métier structure, and creating new ways to explore mixed fisheries data. It was noted that these, in combination with new tools, guidance, and visualizations, helped to provide greater understanding of the models and advice. While these endeavours are ongoing, there was general support for continued development; in particular, the deployment of a mixed fisheries online app to provide end-users and stakeholders with the ability to interact with the multifaceted outputs from mixed fisheries models. Support for, and engagement with, developments on using the Regional Database Estimation System (RDBES) data to make improvements to fleet and métier definitions was also highlighted. Next steps identified were for WGMIXFISH-ADVICE and WGMIXFISH-METHODS to use the valuable feedback obtained to continue to develop the tools, and implement and receive feedback on them as part of an iterative process. It was noted that further research and dedicated time for scientists was necessary to support the ongoing improvements to mixed fisheries advice and data products, and that this should be a priority.
- Workshop on the production of swept-area estimates for all hauls in DATRAS for biodiver-sity assessments (WKSAE-DATRAS)Publication . Arronte, Juan Carlos; Baldó, Francisco; Börjesson, Patrik; Burns, Finlay; Chaves, Corina; Gillespie-Mules, Ruadhán; Kavanagh, Ailbhe; Kelly, Ruth; Kempf, Jed; Kvaavik, Cecilia; Ludwig, Kim; Melli, Valentina; Moriarty, Meadhbh; Rindorf, Anna; Lara, Salvany; Seixas, Sónia; Anne, Sell; Travers-Trolet, Vaishav; Velasco Guevara, Francisco; Wieland, Kai; Hongru, ZhaiThe workshop on the production of swept-area estimates for all hauls in DATRAS for biodiver-sity assessments (WKSAE-DATRAS) considered three groups of surveys for which data are sub-mitted to the Database of Trawl Surveys (DATRAS): various Beam Trawl Surveys, the Northeast Atlantic International Bottom Trawl Survey (Northeast Atlantic IBTS), and the North Sea Inter-national Bottom Trawl Survey (North Sea IBTS). All countries contributing to the above-mentioned surveys were represented by at least one par-ticipant during the workshop, apart from the Netherlands and Norway. The main objectives of the workshop were to establish tow-by-tow swept-area estimates for time-series as far back in time as possible, compare different approaches for the estimates of missing observations, and harmonize the resulting dataseries for biodiversity assessments. For all of the surveys considered, problems with data quality were detected. This included the Beam Trawl Surveys but was most pronounced for the North Sea IBTS. Outliers and potential erroneous data were listed for reporting back to the respective national institutes. In particular, missing observations or algorithms affected wing spread-based swept-area, which is needed in several applications. This workshop compared the Marine Scotland Science-MSS/OSPAR approach, which includes a data quality check for the information needed for the calculation of swept-area, and the DATRAS approach, which depends solely on correctly reported data from the national institutes. Larger data gaps were identified, in particular for several years of the North Sea IBTS. For those surveys, it is proposed that the best possible way forward at this moment is to use estimates based on the MSS/OSPAR approach. However, if dubious records (i.e. extreme outliers) were identified by the MSS/OSPAR and no other information was available, values (e.g. speed over ground or the depth at which a change from short to long sweeps should have happened) were taken from the manual. However, expe-rience has shown that the survey manuals are not followed in all instances, and so persistent country-specific and survey-specific deviations may occur. The national institutes are encouraged to check, correct, and fill in missing survey data through re-submissions to DATRAS. It is recommended that DATRAS data quality control on data sub-mission is extended for the information needed for the calculation of swept-area (e.g. distance, depth, door spread, and wing spread) and that this is done in close cooperation between the ICES Data Centre and the respective ICES survey working groups, WGBEAM (Working Group on Beam Trawl Surveys) and IBTSWG (International Bottom Trawl Survey Working Group).