LOCALITY OF FORMING WINTERING RIVERBED DEPRESSION  IN IRTYSH RIVER

Andrey A. Chemagin

doi:10.24143/2073-5529-2020-4-7-21

UDC 59

LOCALITY OF FORMING WINTERING RIVERBED DEPRESSION IN IRTYSH RIVER

Published in Vestnik of Astrakhan State Technical University. Series: Fishing industry · Issue 4 · Pages 7–21 · Rubric: WATER BIORESOURCES AND THEIR RATIONAL USE

DOI: https://doi.org/10.24143/2073-5529-2020-4-7-21

Received: 15.12.2020 Accepted: 28.11.2025

Authors

Andrey A. Chemagin

Academic degree: candidate of sciences in biology ; candidate of sciences in biology

Tobolsk Complex Scientific Station of the Ural branch of Russian Academy of Sciences Candidate of Biology; Senior Researcher of the Group of Ecology of Aquatic Organisms · Russian Federation · Tobolsk

ABSTRACT

The article describes a new locality of the formed wintering riverbed depression discovered in the erosion zone of the isthmus of conjugate meanders of the Irtysh river for the rational use and effective protection of aquatic biological resources in places of their concentration in the Irtysh river basin (Western Siberia, the Russian Federation. The morphology of the riverbed depression was mapped (relief and bathymetric maps). The maximum depths in the channel depression exceeded 27 m. The channel depression and 4 control river sections were studied. The analysis of hydroacoustic surveys showed that in the wintering riverbed depression there is, according to the statistical data, higher fish density compared to the control areas: in the water area of the riverbed depression the average fish density made 4 524 species/ha, in the control sections 245-2091 sp./ha. The cluster analysis based on the fish density and the size-taxonomic composition of the ichthyofauna has revealed that the riverbed depression is being separated into a cluster, but at the same time goes to the control section No. 4, which is located downstream, where further erosion of the river channel is registered. In this regard, the minimum protection zone of the wintering channel depression should include the water area of the channel depression and the water area of control section No. 4. In the water areas of the riverbed depression and control sections in the spring period, cyprinids dominate - up to 65% of the total number of fish, percids are represented to a lesser extent - 36.76%, coregonids and pikes - up to 18.18, sturgeons - up to 9.31%. The given locality of the wintering riverbed depression must be included in the list of protected river sections of the Fishing Rules for the West Siberian fishery basin for developing the effective strategy for the protection, restoration and rational use of aquatic biological resources, including rare and endangered fish species of the Irtysh River and the whole Ob-Irtysh basin

KEYWORDS

riverbed depression, water area, temporarily limited biotope, fish aggregations, Acipenseridae, Cyprinidae, Perca, pikes, Coregonids

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GOST

Chemagin A. LOCALITY OF FORMING WINTERING RIVERBED DEPRESSION IN IRTYSH RIVER // Vestnik of Astrakhan State Technical University. Series: Fishing industry. 2020. no. 4. pp. 7-21. DOI: https://doi.org/10.24143/2073-5529-2020-4-7-21. (Date of access 28.09.2026).

MLA

Andrey A. Chemagin. "LOCALITY OF FORMING WINTERING RIVERBED DEPRESSION IN IRTYSH RIVER." Vestnik of Astrakhan State Technical University. Series: Fishing industry.4 (2020): 7-21. DOI: https://doi.org/10.24143/2073-5529-2020-4-7-21.

APA

Chemagin A. (2020). LOCALITY OF FORMING WINTERING RIVERBED DEPRESSION IN IRTYSH RIVER. Vestnik of Astrakhan State Technical University. Series: Fishing industry(4), 7-21. https://doi.org/10.24143/2073-5529-2020-4-7-21

Chicago

Andrey A. Chemagin. "LOCALITY OF FORMING WINTERING RIVERBED DEPRESSION IN IRTYSH RIVER." Vestnik of Astrakhan State Technical University. Series: Fishing industry, no. 4 (2020): 7-21. https://doi.org/10.24143/2073-5529-2020-4-7-21.

WIKI

{{cite journal | author = Chemagin A. | title = LOCALITY OF FORMING WINTERING RIVERBED DEPRESSION IN IRTYSH RIVER | journal = Vestnik of Astrakhan State Technical University. Series: Fishing industry | year = 2020 | issue = 4 | pages = 7-21 | doi = 10.24143/2073-5529-2020-4-7-21 }}

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LOCALITY OF FORMING WINTERING RIVERBED DEPRESSION IN IRTYSH RIVER

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