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Long-Term Changes in the Seasonal and Interannual Dynamics of the Abundance of Eggs of Common Pelagophilic Fish Species in the Gdansk Deep of the Baltic Sea

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Abstract

The abundance of eggs of the Baltic cod Gadus morhua Linnaeus, 1758 and the Baltic sprat Sprattus sprattus (Linnaeus, 1758) in the Gdansk Deep of the Baltic Sea was estimated from data for March–August 2015–2022. The estimates were compared with historical data for 1968–1977. In the modern period, the average sprat egg abundance increased one and a half times from 134.7 to 192.6 eggs/m2 and the spawning peak shifted to earlier dates, from May–July 1968–1977 to April–June 2015–2022. The average cod egg abundance decreased by half from 16.3 to 8.0 eggs/m2 and the spawning shifted to 1 month later, from May–June to June–July, which is apparently related to climate change.

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ACKNOWLEDGMENTS

The authors are grateful to the staff of the Baltic Sea Laboratory of the AtlantNIRO (VNIRO) and the staff of the Laboratory for Marine Ecology of the Atlantic Branch of the Shirshov Institute of Oceanology of the Russian Academy of Sciences, who provided the collection of extensive ichthyoplankton material in 2015–2022.

Funding

Expeditionary research on ships of the Atlantic Branch of the Russian Federal Research Institute of Fisheries and Oceanography (VNIRO) and ships of the Shirshov Institute of Oceanology, Russian Academy of Sciences was supported by ongoing institutional funding. Processing of ichthyoplankton samples and data analysis were funded under the state budget theme no. 076-00007-22-00 of the Russian Federal Research Institute of Fisheries and Oceanography (VNIRO). Data interpretation was funded within the framework of the state assignment no. FMWE-2024-0021 to the Shirshov Institute of Oceanology, Russian Academy of Sciences. No additional grants to carry out or direct this particular research were obtained.

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Authors and Affiliations

  1. Atlantic Branch, Russian Federal Research Institute of Fisheries and Oceanography, 236022, Kaliningrad, Russia

    E. M. Karaseva

  2. Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997, Moscow, Russia

    E. E. Ezhova

Authors
  1. E. M. Karaseva
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  2. E. E. Ezhova
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Correspondence to E. M. Karaseva or E. E. Ezhova.

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Ethical standards, which are aimed at minimizing the negative impact of ichthyoplankton collection and processing on the natural environment, were observed to the maximum extent possible.

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Translated by T. Koznova

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Karaseva, E.M., Ezhova, E.E. Long-Term Changes in the Seasonal and Interannual Dynamics of the Abundance of Eggs of Common Pelagophilic Fish Species in the Gdansk Deep of the Baltic Sea. Russ J Mar Biol 50, 43–48 (2024). https://doi.org/10.1134/S1063074024010036

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