Effects of Flow Velocity on the Dynamics of Juvenile Fish Habitats in River Meanders of the Irtysh River
Understanding the spatial distribution of freshwater fish in heterogeneous aquatic environments is crucial for understanding riverine ecosystems and the rational use of aquatic biological resources. This study investigates the distribution patterns of juvenile fish in the lower reaches of the Irtysh...
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MDPI AG
2025-01-01
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| author | Andrey A. Chemagin Elena I. Popova Martin Schletterer |
| author_facet | Andrey A. Chemagin Elena I. Popova Martin Schletterer |
| author_sort | Andrey A. Chemagin |
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| description | Understanding the spatial distribution of freshwater fish in heterogeneous aquatic environments is crucial for understanding riverine ecosystems and the rational use of aquatic biological resources. This study investigates the distribution patterns of juvenile fish in the lower reaches of the Irtysh River, including hydrodynamic conditions during different water level regimes. With hydroacoustic surveys, we assessed fish density and distribution in two wintering riverbed depressions during the spring flood and summer low water period. The main fish aggregations consisted of Cyprinidae and Percidae, with juveniles predominantly occupying areas with reduced flow velocities (0.15–0.75 m s<sup>−1</sup>). Correlation analysis showed strong direct relationships between the area occupied by juvenile carp and perch and zones with specific flow velocities. The study highlights that hydrodynamic characteristics, particularly flow velocity, are key factors influencing the distribution and aggregation of juvenile fish. These findings underscore the importance of considering hydrodynamic factors and species-specific traits in understanding fish distribution patterns and in managing freshwater ecosystems effectively. This research contributes to the understanding of the multifunctional roles of riverbed depressions in supporting juvenile fish populations and emphasizes the importance of hydroacoustics to predict fish distributions in dynamic aquatic environments. |
| format | Article |
| id | doaj-art-5dda6ccc688944f5a41ecace0075a274 |
| institution | Kabale University |
| issn | 1424-2818 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| series | Diversity |
| spelling | doaj-art-5dda6ccc688944f5a41ecace0075a2742025-01-24T13:29:33ZengMDPI AGDiversity1424-28182025-01-011716810.3390/d17010068Effects of Flow Velocity on the Dynamics of Juvenile Fish Habitats in River Meanders of the Irtysh RiverAndrey A. Chemagin0Elena I. Popova1Martin Schletterer2Tobolsk Complex Scientific Station of Ural Branch of the Russian Academy of Sciences (UrB RAS), Akademika Yuriya Osipova Street 15, 626150 Tobolsk, RussiaTobolsk Complex Scientific Station of Ural Branch of the Russian Academy of Sciences (UrB RAS), Akademika Yuriya Osipova Street 15, 626150 Tobolsk, RussiaInstitute of Hydrobiology and Aquatic Ecosystem Management, University of Natural Resources and Life Sciences, Vienna (BOKU University), Gregor-Mendel-Straße 33, 1180 Vienna, AustriaUnderstanding the spatial distribution of freshwater fish in heterogeneous aquatic environments is crucial for understanding riverine ecosystems and the rational use of aquatic biological resources. This study investigates the distribution patterns of juvenile fish in the lower reaches of the Irtysh River, including hydrodynamic conditions during different water level regimes. With hydroacoustic surveys, we assessed fish density and distribution in two wintering riverbed depressions during the spring flood and summer low water period. The main fish aggregations consisted of Cyprinidae and Percidae, with juveniles predominantly occupying areas with reduced flow velocities (0.15–0.75 m s<sup>−1</sup>). Correlation analysis showed strong direct relationships between the area occupied by juvenile carp and perch and zones with specific flow velocities. The study highlights that hydrodynamic characteristics, particularly flow velocity, are key factors influencing the distribution and aggregation of juvenile fish. These findings underscore the importance of considering hydrodynamic factors and species-specific traits in understanding fish distribution patterns and in managing freshwater ecosystems effectively. This research contributes to the understanding of the multifunctional roles of riverbed depressions in supporting juvenile fish populations and emphasizes the importance of hydroacoustics to predict fish distributions in dynamic aquatic environments.https://www.mdpi.com/1424-2818/17/1/68fishhabitatsriverbed depressionmonitoringhydroacousticsechosounder |
| spellingShingle | Andrey A. Chemagin Elena I. Popova Martin Schletterer Effects of Flow Velocity on the Dynamics of Juvenile Fish Habitats in River Meanders of the Irtysh River Diversity fish habitats riverbed depression monitoring hydroacoustics echosounder |
| title | Effects of Flow Velocity on the Dynamics of Juvenile Fish Habitats in River Meanders of the Irtysh River |
| title_full | Effects of Flow Velocity on the Dynamics of Juvenile Fish Habitats in River Meanders of the Irtysh River |
| title_fullStr | Effects of Flow Velocity on the Dynamics of Juvenile Fish Habitats in River Meanders of the Irtysh River |
| title_full_unstemmed | Effects of Flow Velocity on the Dynamics of Juvenile Fish Habitats in River Meanders of the Irtysh River |
| title_short | Effects of Flow Velocity on the Dynamics of Juvenile Fish Habitats in River Meanders of the Irtysh River |
| title_sort | effects of flow velocity on the dynamics of juvenile fish habitats in river meanders of the irtysh river |
| topic | fish habitats riverbed depression monitoring hydroacoustics echosounder |
| url | https://www.mdpi.com/1424-2818/17/1/68 |
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