Articles | Volume 18, issue 4
https://doi.org/10.5194/bg-18-1321-2021
https://doi.org/10.5194/bg-18-1321-2021
Research article
 | 
22 Feb 2021
Research article |  | 22 Feb 2021

Changes in population depth distribution and oxygen stratification are involved in the current low condition of the eastern Baltic Sea cod (Gadus morhua)

Michele Casini, Martin Hansson, Alessandro Orio, and Karin Limburg

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Short summary
In the past 20 years the condition of the eastern Baltic cod has dropped, with large implications for the fishery. Our results show that simultaneously the cod population has moved deeper while low-oxygenated waters detrimental for cod growth have become shallower. Cod have thus dwelled more in detrimental waters, explaining the drop in its condition. This study, using long-term fish and hydrological monitoring data, evidences the impact of deoxygenation on fish biology and fishing.
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