The Influence of Changes in the Hydrological Regime of the Ural River in the West Kazakhstan Region on Fish Resources
The Ural River is one of the main fisheries reservoirs of Kazakhstan. Its hydrological regime has been unstable over the past 10 years, which has affected the formation of fish resources. The present study has shown that commercial fish populations decrease from year to year due to the deterioration of spawning conditions in low-water years, when spawning grounds are not fully watered. In these years, the spawning efficiency decreased from 11% to 70%.
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