Working Group on Mackerel and Horse Mackerel Egg Surveys (WGMEGS)

• Main Authors: Alvarez, Paula, Blom, Ewout, Burns, Finlay, Costas, Gersom, dos Santos Schmidt, Thassya, Farrell, Edward, Garabana, Dolores, Holah, Hannah, Huwer, Bastian, Eliasen, Solva Karadottir, Korta, Maria, Angelico, Maria Manuel, Nash, Richard, Nunez, Cristina, Nunez-Riboni, Ismael, O'Hea, Brendan, Politis, Sebastian N., Riveiro, Isabel, Thorsen, Anders, Tomkiewicz, Jonna, Ulleweit, Jens, van Damme, Cindy
• Format: Report
• Language: English
• Published: ICES 2023
• Subjects: Text; ddc:570; WGMEGS > mackerel egg surveys > horse mackerel egg surveys > horse mackerel in the Northeast Atlantic > fish eggs > egg survey > sampling methods > survey data > adult egg > production methods > North Sea horse mackerel; Faroe Islands; Norway; Northeast Atlantic
• Online Access: https://doi.org/10.17895/ices.pub.23790201; https://www.openagrar.de/receive/openagrar_mods_00088951; https://www.openagrar.de/servlets/MCRFileNodeServlet/openagrar_derivate_00054199/dn066643.pdf

The ICES Working Group on Mackerel and Horse Mackerel Egg Surveys (WGMEGS) coordinates the mackerel and horse mackerel egg surveys in the Northeast Atlantic (NEA) and the mackerel egg survey in the North Sea. This report focuses on the execution, and results, of the surveys (MEGS) conducted during 2022. In 2022, the survey once again faced significant challenges with regards to its ability to provide adequate geographical and temporal coverage, given the limited vessel resources at its disposal. In 2022, Portugal, Spain (IEO and AZTI), Ireland, UK/Scotland, the Netherlands, Germany, the Faroe Islands, and Norway participated in the egg survey in the western and southern areas. Denmark and UK/England, with some additional assistance from Norway, surveyed the North Sea as a single-pass DEPM survey. This is the first time in many years that both the Atlantic and North Sea surveys have been conducted in the same year. WGMEGS notes that the expansion of recent surveys during periods 5 and 6 occurred again in 2022. While the northern and western boundary was not contained, the number of eggs being missed in this area would not contribute significantly to the overall SSB calculation. Due to difficulties encountered by the Irish survey in period 6 this area was not surveyed. Mackerel daily egg production was highest in period 5 for the western component, while for the southern component the maximum spawning intensity was observed in period 3. Total mackerel egg production for southern and western components combined was 2.093 * 1015 eggs. The realised fecundity estimate was 1268 egg per gram female, resulting in an SSB index of 3.565 * 106 tonnes.The total 2022 Daily egg production (P0tot) for mackerel in the North Sea was 0.691*1013 eggs/day, a 50% decrease in egg numbers reported during the 2021 survey. For the Western stock of horse mackerel highest mean daily egg production was estimated during period 6. Spawning was very low throughout all survey periods, with an obvious peak occurring in period 6. Total annual egg ...