International Bottom Trawl Survey Working Group (IBTSWG)

• Main Authors: Auber, Arnaud, Baldó, Francisco, Bielli, Alessandra, Bland, Barbara, Burns, Finlay, Chaves, Corina, Cresson, Pierre, De Groote, Annica, Denechaud, Côme, Drewery, Jim, Eidset, Elise, Ellis, Jim, Ellis, Jonathan S., Mules, Ruadhan Gillespie, Giraldo, Carolina, Girardin, Raphaël, Giulietti, Lucilla, Griffin, Frankie, Haslob, Holger, Hatton, Benjamin, Hilvarsson, Annelie, Hjorleifsson, Einar, Holdgate, Alex, Humphreys, Richard, Huwer, Bastian, Kelly, Ruth, Kvamme, Cecilie, Kynoch, Rob, Laffargue, Pascal, Le Roy, Didier, Ludwig , Kim, Phillips , Sophy McCully, McKeon, Caroline, Miethe, Tanja, Mosegaard, Henrik, Neumann, Hermann, Orio, Alessandro, Pastoors, Martin, Politis, Philip, Reecht, Yves, Schuchert, Pia, Sell, Anne, Sinclair, Louisa, Soni, Vaishav, Stokes, David, Storesund, Julia, Wieland, Kai, Hal, Ralf Van, Vansteenbrugge, Lies, Velasco Guevara, Francisco, Villamor, Adriana, Villanueva, Ching, Warwick, David, White, Jonathan, Wienerroither, Rupert, Wilhelms, Ingo
• Format: Book
• Language: English
• Published: International Council for the Exploration of the Sea (ICES) 2023
• Subjects: /dk/atira/pure/sustainabledevelopmentgoals/life_below_water; name=SDG 14 - Life Below Water; Northeast Atlantic
• Online Access: https://orbit.dtu.dk/en/publications/8d51bed9-9833-4c62-9f51-4bd9f13554f7; https://doi.org/10.17895/ices.pub.23743989; https://backend.orbit.dtu.dk/ws/files/341381771/IBTSWG_Report_2023.pdf

The International Bottom Trawl Survey Working Group (IBTSWG) coordinate fishery-independent bottom trawl surveys in the ICES Area (Northeast Atlantic and North Sea) providing an important platform for the collection of additional data such as sampling larval sprat, stomach contents and fish parasites. These long-term monitoring surveys provide data for stock assessments and facilitate analyses of the distributions and relative abundance of fish. IBTSWG promotes the standardization of fishing gears and methods. This report summarizes national contributions in 2022–2023 and plans for the 2023–2024 surveys. In the North Sea, the surveys are performed in Quarter 1 and Q3. The Northeast Atlantic surveys are conducted mostly in Q1, Q3, and Q4 with a suite of 14 national surveys covering large areas of continental shelf extending from northern Scotland to the Gulf of Cádiz. The 2023-Q1 North Sea IBTS was impacted slightly by mechanical issues on one vessel, resulting in some of the Rectangles in the central North Sea being sampled with a single haul instead of the planned two. The 2022-Q3 North Sea IBTS was broadly complete, with the overall number of hauls comparable to previous years, though some Rectangles close to shore or with obstructions may not have had full coverage. The Northeast Atlantic surveys were mostly completed successfully, with the exception of the Scottish west coast groundfish survey in Q1 (cancelled due to vessel breakdown). There was incomplete survey coverage for some of the surveys, including the EVHOE survey (severe weather) and Portuguese groundfish survey (severe weather and mechanical problems). The Spanish surveys in the Gulf of Cádiz (cancelled in 2021) were undertaken in 2022. Recent updates to DATRAS, where the trawl survey data are stored, were summarised and data quality, including catch weights and species identification, was reviewed. IBTSWG met with members of various data users, including relevant stock assessment groups, such as WGNSSK, WGEF and HAWG, presenting summaries of ...