Working Group on the Assessment of Demersal Stocks in the North Sea and Skagerrak (WGNSSK)

• Main Authors: Orio, Alessandro, Kempf, Alexander, Kokkalis, Alexandros, Sundelöf, Andreas, Mesquita, Carlos, Chen, Chun, Ulrich, Clara, Needle, Coby, Vitale, Francesca, Søvik, Guldborg, Cole, Harriet, Haslob, Holger, Nielsen, J. Rasmus, Skjæraasen, Jon Egil, De Oliveira, José, Batsleer, Jurgen, Korsbrekke, Knut, Vansteenbrugge, Lies, Taylor, Marc, Ulmestrand, Mats, Girardin, Raphaël, Ourens, Rosana, Verkempynck, Ruben, Millar, Sarah, Miethe, Tanja, van Broekhoven, Wouter, Lambert, Gwladys, Bell, Ewen, Feekings, Jordan P., Walker, Nicola, Vermard, Youen
• Format: Book
• Language: English
• Published: ICES 2019
• Subjects: /dk/atira/pure/sustainabledevelopmentgoals/life_below_water; name=SDG 14 - Life Below Water; Turbot
• Online Access: https://orbit.dtu.dk/en/publications/ba84a896-0dff-443d-830b-4763764030f7; https://doi.org/10.17895/ices.pub.5402; https://backend.orbit.dtu.dk/ws/files/234552811/01_WGNSSK_Report_2019.pdf

The main terms of reference for the The ICES Working Group for the Assessment of Demersal Stocks in the North Sea and Skagerrak (WGNSSK) were: to update, quality check and report relevant data for the working group, to update and audit the assessment and forecasts of the stocks, to produce a first draft of the advice on the fish stocks and to prepare planning for benchmarks in future years. Ecosystem changes have been analytically considered in the assessments for cod, haddock and whiting in the form of varying natural mortalities estimated by the ICES Working Group on Multi Species Assessment Methods (WGSAM). Benchmarks and Inter-benchmarks in 2018/2019 No full benchmarks were conducted during 2019 for WGNSSK stocks. However, there were several inter-benchmark protocol (IBP) meetings during 2018/2019. These were on North Sea turbot and saithe, and on sole in 7.d. State of the Stocks The main impression in recent years is that fishing mortality has been reduced substantially for many North Sea stocks of roundfish and flatfish compared to the beginning of the century. All fish stocks with agreed reference points (Category 1 stocks) are above B lim , apart from cod in 4, 7.d and 20, and only the SSBs of cod in 4, 7.d and 20 and whiting in 4 and 7.d are below MSY B trigger at the beginning of 2019. Several North Sea stocks are exploited at or below F MSY levels (saithe in 3.a, 4 and 6, plaice in 4 and 20, plaice in 7.d, sole in 7.d, and turbot in 4); however, just as many are being fished above FMSY (cod in 4, 7.d and 20, haddock in 4, 6.a and 20, whiting in 4 and 7.d, sole in 4, and witch in 3.a, 4 and 7.d). An important feature is that recruitment still remains poor compared to historic average levels for most gadoids, although there are signs of a strong recruitment for haddock in 2019 (the strongest since the 1999 year-class; to be confirmed with future data). All Nephrops stocks with agreed biomass reference points (Category 1 stocks, excluding nep.fu.3-4) are currently above MSY Bt rigger , and all Nephrops ...