Report
Monitoring winter spawning activity of Western Baltic cod (Gadus morhua) (2021-25), Cruise No. AL606, January 22nd – January 30th 2024, Kiel (Germany) – Kiel (Germany), Winter cod 2021-25
| العنوان: | Monitoring winter spawning activity of Western Baltic cod (Gadus morhua) (2021-25), Cruise No. AL606, January 22nd – January 30th 2024, Kiel (Germany) – Kiel (Germany), Winter cod 2021-25 |
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| المؤلفون: | Funk, Steffen, Möllmann, Christian |
| بيانات النشر: | Institute of Marine Ecosystem and Fisheries Science, University of Hamburg |
| سنة النشر: | 2023 |
| المجموعة: | OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
| الوصف: | This cruise was the fourth out of five proposed cruises in the framework of the winter cod 2021- 25 cruises of the IMF, which aim to investigate the early winter spawning activity of Western Baltic cod. For this purpose, ichthyoplankton samples and cod samples were taken on a pre-defined station grid. Cod samples were used to investigate maturity stages and condition of adult cod. Plankton samples were analysed with a focus on the occurrence of cod eggs and larvae. The data will be used to identify whether there is a shift towards earlier spawning activities of Western Baltic cod and how spawning activity differs spatially between parts of the Belt Sea. During the cruise AL606 spawning cod were found in the Kiel Bight, the Mecklenburg Bight, and the Fehmarn Belt. First analyses of BONGO-net samples revealed no occurrence of cod larvae in the sampling area during this year’s January cruise 2024. This absence of cod larvae might be a result of the relatively harsh and cold winter of 2023/24 and an associated delay in the maturation and spawning of western Baltic cod compared to the warmer previous years 2021-2023. The observation of fewer larvae of other fish species (e.g., plaice) compared to previous years supports this hypothesis. However, especially the observation of spawning and post-spawning cod in the Mecklenburg Bight during AL606 provided further evidence for the hypothesised temporal shift in spawning phenology towards an earlier onset than described in the past. |
| نوع الوثيقة: | report |
| وصف الملف: | text |
| اللغة: | English |
| Relation: | https://oceanrep.geomar.de/id/eprint/60103/1/AL606_Cruise_Report_final_corr.pdf; Funk, S. and Möllmann, C. (2023) Monitoring winter spawning activity of Western Baltic cod (Gadus morhua) (2021-25), Cruise No. AL606, January 22nd – January 30th 2024, Kiel (Germany) – Kiel (Germany), Winter cod 2021-25. Open Access . Alkor-Berichte, AL606 . Institute of Marine Ecosystem and Fisheries Science, University of Hamburg, 35 pp. DOI 10.3289/CR_AL606 . |
| DOI: | 10.3289/CR_AL606 |
| الاتاحة: | https://oceanrep.geomar.de/id/eprint/60103/ https://oceanrep.geomar.de/id/eprint/60103/1/AL606_Cruise_Report_final_corr.pdf https://doi.org/10.3289/CR_AL606 |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.4F9EDD4E |
| قاعدة البيانات: | BASE |
| DOI: | 10.3289/CR_AL606 |
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