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September 5, 2025Open Access

On the issue of the regulation of marine fishing in the eastern part of the Northern Caspian Sea on the example of the walleye Sander lucioperca (Linnaeus, 1758)

Key Points

Zander stocks in the eastern Northern Caspian Sea have significantly declined due to overfishing during migration.
Long-term data spanning about 100 years indicates that simultaneous fishing in the river and sea exacerbates stock depletion.
The proposal includes expanding the marine fishing area while limiting fishing during spawning times in the river.
Improved fishing regulations may restore zander populations, benefiting ecosystems and local fisheries.

Abstract

The paper presents long-term (about 100 years) data on the stocks and fishing of zander in the eastern part of the Northern Caspian Sea. The reasons for the decline in its catches in this part of the sea and in the Ural River (Zhayyk) are analyzed. It is shown that the simultaneous fishing of zander in its feeding area in the sea and during its spawning migrations in the river is one of the reasons for the decline in its stocks. It is proposed to expand the fishing area in the sea while reducing the fishing of the spawning part of the zander population in the Ural River (Zhayyk).

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