Changes in the species composition and abundance of young-of-the-year fishes in the upper Volga stretch of the Kuibyshev Reservoir during the period of 1991 to 2009

Galanin, Igor F.; Ananin, A. N.; Kuznetsov, V. A.; Сергеев, А. С.

doi:10.1134/s1067413614040055

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…To estimate the current significance of the area under consideration, the data obtained were compared with similar materials from 2017-2020 and earlier period 1993-1998. These materials were collected were collected by the authors at the same stations using the same methods and partially published earlier [7,8].…”

Section: Methodsmentioning

confidence: 99%

“…In the reservoir the reproduction efficiency for many fish species is determined by the level and temperature regimes during the spawning season [5,6]. At the same time, it was noted that the importance of different sites of the reservoir for reproduction is not the same and may change over time [7,8]. In this regard, areas where monitoring the efficiency of reproduction are carried out regularly are of particular interest.…”

Section: Introductionmentioning

confidence: 99%

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Changes in the value of the Volga-Sviyazhsky area for fish reproduction the largest reservoir in Europe - the Kuibyshev reservoir

Kuzyuk,

Galanin,

Smirnov

et al. 2023

E3S Web Conf.

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To estimate the current significance of the area for fish breeding, the species composition and abundance of young-of-the-year of the coastal zone of the Volga-Sviyazhsky area of the Volga stretch of the Kuibyshev reservoir for 2021, 2022 were considered. The work to assess the species composition and abundance of the young fish was carried out at 7 coastal stations, at depths less than 2 meters. The number of young-of-the-year was calculated per unit of effort of the fingerling seine. Species diversity was assessed using the Shannon-Weaver index. Young of 23 fish species were identified, which confirms the reproduction of these species in the study area. Observational data are compared with earlier materials from 1993-2020. A trend towards an increase in the relative abundance and the species diversity of the young of fish, mainly due to low-value species, was noted. At the same time, in 2022, a relatively high abundance of the young, the main commercial species of the reservoir, the bream, was revealed.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Changes in the value of the Volga-Sviyazhsky area for fish reproduction the largest reservoir in Europe - the Kuibyshev reservoir

Kuzyuk,

Galanin,

Smirnov

et al. 2023

E3S Web Conf.

View full text Add to dashboard Cite

show abstract

“…Багаторічне дослідження динаміки чисельності молоді риб у басейні р. Волга (1991-2009 рр.) показало, що на фоні скорочення чисельності молоді багатьох видів риб весняного розмноження відбувається збільшення чисельності та видового різноманіття видів з літнім розмноженням (Galanin, Ananin, Kuznetsov, & Sergeev, 2014).…”

Section: вступunclassified

The Temporal Dynamic of Young Fish Communities in the Water Bodies of the �Dnipro-Orylskiy� Nature Reserve

Bondarev¹,

Fedyushko²,

Gubanova³

et al. 2020

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The paper identifies regularities of temporary dynamics of the communities of juvenile fish communities in different types of reservoirs of the Dnipro-Orylskiy” Nature Reserve during 1997–2015 and assesses the role of the Reserve as a factor of fish population reproduction within the water area, which is exposed to a significant anthropogenic impact. During the research period, we have identified representatives of 38 fish species. The main trends in the dynamics of synecological characteristics of the juvenile fish communities are explained by the influence of three sources of variation: controlled discharge of the Dnieper River as a result of the creation of a dam cascade, eutrophication, and the reserve regime. The first two sources of influence are negative, while the creation of a protective regime in the Reserve is a positive factor. Eutrophication in the direction of its influence coincides with the negative effects of regulated discharge and significantly enhances them. The creation of a reservoir and regulation of the Dnieper River flow manifests itself differently in different types of reservoirs in the Reserve depending on their typological characteristics. The influence of the eutrophication factor may also manifest itself differently in different types of lake systems. The results we have obtained indicate that for the studied system of reservoirs in general, there is no tendency to change the number of fish communities and this indicator is stationary over time. For the channel part of the Dnieper River and its immediate vicinity, the Orel River mouth has established a trend of increasing the number of fish fry communities, while in other types of reservoirs there is no stable trend, except for reservoirs of Obukhovskie floodplain, where the number of juvenile fish communities has been constantly decreasing. In terms of biomass, there is also an upward trend in these water bodies as well as in the water bodies of the Taromsk ledge. An increase in the number and biomass of communities is accompanied by an increase in the number of species and diversity in Shannon. We explain the decrease in the number of fry communities in the Obukhov floodplain by intensive eutrophication processes, which are most active in these very reservoirs. We attribute the greatest activation of eutrophication processes to the construction of the Orel Canal in the Obukhov floodplain reservoir system. This artificial reservoir drains the lakes of the Obukhovskaya system, eventually contributing to the accumulation of organic matter and the development of oxygen deficiency phenomena in them. In the event of flooding, which is generally less likely due to the regulated flow of the Dnieper River, a fixed level in the Obukhov floodplain is maintained due to the close proximity of the Orel Canal. Water exchange and the associated evacuation of excess organics from the lakes are significantly limited. Stagnation and constant accumulation of organic remains create unfavorable conditions for life and development of young fish. As prospects for further studies, we plan to carry out geobotanical descriptions of aquatic macrophyte communities for phytoindication of ecological regimes of living conditions of fish population in water bodies.

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Changes in the species composition and abundance of young-of-the-year fishes in the upper Volga stretch of the Kuibyshev Reservoir during the period of 1991 to 2009

Cited by 2 publications

References 4 publications

Changes in the value of the Volga-Sviyazhsky area for fish reproduction the largest reservoir in Europe - the Kuibyshev reservoir

Changes in the value of the Volga-Sviyazhsky area for fish reproduction the largest reservoir in Europe - the Kuibyshev reservoir

The Temporal Dynamic of Young Fish Communities in the Water Bodies of the �Dnipro-Orylskiy� Nature Reserve

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