Biodiversity of Objects of Aquatic Bioresources of the Volga-Caspian Fishery Area

Mirzoyan, A. V.; Khodorevskaya, R. P.

doi:10.24143/2073-5529-2017-4-49-60

Cited by 4 publications

(1 citation statement)

References 2 publications

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“…According to historical references, narrow-clawed crayfish have been harvested mainly in the lower part of the Volga basin and in the Caspian Sea since the 1880s [6]. In 1910-1974, the crayfish fishery on the eastern coast of the Caspian Sea resulted in annual catches of about 50 tons on average, ranging from 0.96 tons (1998) to 119 tons (1962) [6,7].…”

Section: Resultsmentioning

confidence: 99%

Some features of crustacean cultivation aquabiotechnology on the waters of energy facilities

2021

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The data on the state of the crayfish population on the territory of the Middle Volga before its regulation and after the formation of reservoirs are presented. Three stages in the state of development of aquabiotechnology of the crustaceans cultivation in the Middle Volga region have been identified. The first stage is before regulation of the Volga river. The second stage is pasture aquaculture in reservoirs with works on the targeted improvement of aquatic ecosystems. It is shown that the size-weight and ecological-biological characteristics of long-clawed crayfish before the regulation of the river and after the formation of the Kuibyshev reservoir are similar. The third stage is highlighted in connection with the expansion of biotechnologies for growing thermophilic crayfish in recirculating aquaculture systems. At the present stage, in the Kuibyshev and Nizhnekamsk reservoirs, there are narrow-clawed (Pontastacus leptodactylus Esch.) and wide-clawed crayfish (Astacus astacus L.). The catches contain crayfish of three ages: two-year-olds - about 100 mm, three-year-olds - about 150 mm, four-year-olds - about 170 mm long. The equation for the dependence of body weight on the zoological length of narrow-clawed crayfish in the Kuibyshev reservoir: y = 0.67x +81.3. The cultivation of the red claw crayfish Cherax quadricarinatus (VonMartens, 1868) on the warm waters of energy facilities can become an important element of aquaculture for the production of elite gourmet products. The equation for the dependence of body weight on the zoological length of red claw crayfish in a recirculating aquaculture system: y = 1.1x +57.3. The development of aquatic biotechnologies makes it possible to use natural crayfish populations for the creation of crayfish farms and pasture aquaculture on the basis of reservoir waters, and the use of warm waters makes it possible to grow new aquaculture objects for the industrial crayfish cultivation all year round. At the same time, natural ecosystems are not disturbed, and the rate of growth of marketable products under controlled production conditions allows not only to increase the volume of aquaculture products, but also to reduce the pressure of catch of crayfish from natural ecosystems.

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Section: Resultsmentioning

confidence: 99%

Some features of crustacean cultivation aquabiotechnology on the waters of energy facilities

2021

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Results of ichtiological studies in the deep-water section of the Yellow River — a potentially possible winter pit

Chekhomov

Barabanov

Vasilieva

2020

Rybovodstvo I Rybnoe Hozjajstvo (Fish Breeding and Fisheries)

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Wintering pits of semi-passable and river fish on the Lower Volga have historically had a protected status that prohibits any fishing in their waters. The wintering period is important in the life of semi-migratory and river fish, and directly affects the formation of their stocks. The process of pit formation in the Volga Delta is continuous. At the same time, some of the pits lose their fishing significance over time, while others, newly formed, on the contrary, have mass accumulations of fish, especially in the pre-winter and winter periods. The aim of the work was to study the structure of the fish population in the deep-water section of the river-a potential wintering pit. The seasonal and spatial dynamics of the species composition of the fish population, their concentrations in the pit and in the adjacent riverbed are shown. It is noted that the studied area is a typical wintering pit of the Volga river Delta, where common catfish Silurus glanis (Linnaeus, 1758), carp Cyprinus carpio carpio (Linnaeus, 1758) and walleye Sander lucioperca (Linnaeus, 1758), which form the basis of research (control) catches (more than 90%), lie for the winter. High indicators of the relative number of fish were observed throughout the study period, which indicates a high productivity of the deep-water object, in terms of the formation of pre-winter and winter concentrations, which is associated with favorable conditions for wintering semi-passable and river fish (depth, flow rates, etc.). The Pit meets the developed ichthyological criterion and is a place of mass concentrations of fish suitable for wintering. In order to preserve and restore the resource potential of the Lower Volga, the winter pit on the Yellow river should be recommended for inclusion in the List of winter pits of the fishing Regulations for the Volga-Caspian fisheries basin (Astrakhan region). The protected status of the site will allow you to remove the winter pit from the fishing zone, including Amateur fishing, preventing its looting in the future

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Prerequisites for the expansion of the range of golden grey mullet Chelon auratus (Risso, 1810) in the conditions of inconstancy of the salt regime of the northern part of the Caspian Sea

Gavrilova¹,

Lardygina²,

Barabanov³

2022

Fish Breeding and Fisheries

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In the Caspian Sea, as in any natural body of water, the distribution and dynamics of the number of fish, including mullet, is due to the combined influence of environmental factors. In the present period of regression of the sea and changes in the level of runoff of the Volga River, salinity plays an important role in the life cycle of all representatives of the ichthyofauna. The article is devoted to the topical issue of the impact of the salt regime on the spatial and quantitative characteristics of the mullet population. The distribution and its relative abundance in 2016 and 2019 observations are presented. The distribution areas are mapped with a detailed description of the features of the formation of concentrations during two contrasting periods: desalination and salinization of the sea. Analyzing the data of trawl catches, it was found that in 2016, when the powerful Volga runoff led to the expansion of desalination zones, the average catch of mullet was 7 copies/an hour of trawling. It is noteworthy that this indicator has grown to 11 copies/an hour of trawling, during the salinization of the Northern Caspian in low-water 2019 Graphical data confirming the presence of a direct correlation between the relative abundance of mullet and increasing salinity gradients are presented. It is shown that for two years the value of the correlation coefficient was 0.74–0.76. Mullet was caught in areas with salinity from 2 to 17%. It was found that the majority of concentrations (68–74%) were formed in marine waters from 8%. In conclusion, it is concluded that the increase in salinity indicators of the northern part of the Caspian Sea has a positive effect on the expansion of the range of mullet.

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Biodiversity of Objects of Aquatic Bioresources of the Volga-Caspian Fishery Area

Cited by 4 publications

References 2 publications

Some features of crustacean cultivation aquabiotechnology on the waters of energy facilities

Some features of crustacean cultivation aquabiotechnology on the waters of energy facilities

Results of ichtiological studies in the deep-water section of the Yellow River — a potentially possible winter pit

Prerequisites for the expansion of the range of golden grey mullet Chelon auratus (Risso, 1810) in the conditions of inconstancy of the salt regime of the northern part of the Caspian Sea

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