QUANTITY AND DISTRIBUTION OF CASPIAN ROACH, BREAM AND PIKE PERCH UNDERYEARLINGS IN THE NORTH-WEST OF THE CASPIAN SEA IN CONDITIONS OF THE VOLGA HIGH WATER AND LOW WATER RUN OFF

The article presents the comparative analysis of quantity and the distribution of Caspian roach, bream and pike perch underyearlings in western part of the northern Caspian in the current context of the Volga river high water and low-water run-off in 2013-2016. It has been shown that, depending on conditions of each year, the quantity of the three species underyearlings varies too much. The biggest number of Caspian roach and bream in the period under review was observed in 2013 and 2016, and the biggest pike perch quantity - in 2016. In spite of certain variability, the quantity of Caspian roach and pike perch underyearlings stays low today. Bream quantity in some years increased up to the level of middle yielding generations. In spite of low quantity, Caspian roach underyearlings almost completely developed feeding territories of western part of the north Caspian in both high water and in low-water years. The foraging area of bream and especially of pike perch underyearlings is smaller than Caspian roach one. They spread to the maximum upon the water area of the Caspian Sea in 2016, that year was the most favorable in salinity for generative freshwater fish for the last few years. Caspian roach underyearlings generally gained weight in waters with salinity over 8‰, bream - in desalinated areas with salinity up to 5‰. Pike perch underyearlings stayed in desalinated areas during the high water years; they were found across the studied spectrum with low (0-5‰), high (>10‰) and moderate water salinity (5-8‰) during the low-water years.

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State of populations and fishing of semi-anadromous fish in the North-Eastern Caspian sea

Rybovodstvo i rybnoe hozjajstvo (Fish Breeding and Fisheries) ◽

10.33920/sel-09-2104-02 ◽

2021 ◽

pp. 22 (87)-30 (94)

Author(s):

Askarbay Kadralievich Kamelov

Keyword(s):

Caspian Sea ◽

Water Area ◽

The State ◽

Anthropogenic Factors ◽

Anadromous Fish ◽

The Caspian Sea ◽

The North ◽

Natural Reproduction ◽

Pike Perch ◽

North Eastern

Semi-anadromous fish (roach, bream, pike-perch, asp) are the main objects of fishing in the coastal zone of the North-Eastern part of the Caspian Sea. The state of the populations of these fish changes significantly under the influence of natural and, especially, anthropogenic factors, which have increased in recent years. The aim of this work was to study the current state of populations of semi-anadromous fish in the NorthEastern Caspian Sea. Based on the materials of three years of research (2016, 2018, 2020), with the involvement of literary sources, long-term changes in the size-weight and, age indicators, nutritional status of fish and the sex ratio in populations are considered. It has been established that the state of the semi-anadromous fish populations in the North-Eastern Caspian remains tense at the present time. All populations are characterized by general negative patterns of state change. There are tendencies of decrease in size, weight and age indicators, the number of populations and fish catches are decreasing. These changes were least of all manifested in bream (whose state is relatively stable) and were most pronounced in pike perch. The depressive state of the populations is explained by a decrease in the scale of natural reproduction in recent years, due to a decrease in the water content of the Ural River and the number of spawners allowed to spawn on the river. Marine fisheries in the North-Eastern Caspian are concentrated in shallow waters, which increases the fishing load on semi-anadromous fish and prevents their passage to spawning. It is necessary to reduce the pressure of fishing by reducing the number of nets used in the shallow water area of the North-Eastern Caspian and strict observance of the rule of the forbidden pre-estuary space of the river Ural. English version of the article on pp. 87-94 is available at URL: https://panor.ru/articles/state-of-populations-and-fishing-of-semi-anadromous-fish-in-the-north-eastern-caspian-sea/64076.html

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MODERN STATUS OF THE MICROECOSYSTEMS OF THE NORTHERN CASPIAN

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2018-4-30-38 ◽

2018 ◽

pp. 30-38

Author(s):

Svetlana Aleksandrovna Dyakova ◽

Ecatherina Rafaelevna Galyautdinova ◽

Elena Glebovna Lardygina

Keyword(s):

Water Quality ◽

Antimicrobial Agents ◽

Vegetation Period ◽

High Water ◽

Water Area ◽

Multi Drug Resistance ◽

The Caspian Sea ◽

Volga River ◽

The North ◽

Pathogenic Factors

The article highlights the data on the abundance of saprotrophic bacterioplankton and bacteriobenthos in the water area of the Northern Caspian in the period from 2013 to 2017. There has been described the influence of the Volga river runoff during the spring flood on bacterioplankton and bacteriobenthos in the northern part of the Caspian Sea. The number of saprotrophic bacterioplankton in the spring period depended on water content; the minimum of saprotrophs was recorded in 2015 (low water year), maximum - in 2016 (high water year). Studying the vertical distribution of saprotrophs number showed that near the bottom it was somewhat less than on the surface. The most favorable sanitary situation in the Northern Caspian was registered in 2015 (throughout the year, water quality was estimated as clean), unfavorable periods occurred in 2013 and 2016 (during nearly whole vegetation period water quality was estimated as contaminated). In the bottom sediments seasonal changes of saprophytes completely corresponded to bacterioplankton, the abundance of bacteriobenthos exceeding the parameters of bacterioplankton. There has been studied species composition of saprophyte bacteriocenoses of the North Caspian, determined the dynamics of yearly occurrence of different groups and families of microorganisms. In the period from 2013 to 2016 there was observed a decline in the number of species of microorganisms, in 2017, species diversity increased slightly. In summer months and at the beginning of autumn species maximum was observed, in spring and late autumn there was registered species minimum. Most of isolated bacteria belonged to a group of opportunistic pathogens, while true saprophytes were much less common. Among the isolated species there have been determined potentially pathogenic microorganisms, their pathogenic activity and antibiotic resistance have been studied. The presence of one or more pathogenic factors, together with multi-drug resistance of bacteria to antimicrobial agents proved the potential danger of these representatives of bacterioplankton and bacteriobenthos for hydrobionts and humans.

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THE NUMBER OF UNDERYEARLINGS OF ROACH, BREAM AND PIKE-PERCH IN THE WESTERN PART OF THE NORTHERN CASPIAN SEA IN 2012-2016

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2017-3-9-16 ◽

2017 ◽

pp. 9-16 ◽

Cited By ~ 1

Author(s):

Ljubov’ Aleksandrovna Belogolova ◽

Tatyana Anatolievna Solokhina

Keyword(s):

Fish Species ◽

Caspian Sea ◽

High Water ◽

Breeding Population ◽

Water Area ◽

Population Number ◽

Volga River ◽

Weight Density ◽

Pike Perch ◽

Minimum Number

The article presents the data obtained in the result of scientific research expeditions aiming to determine abundance of roach ( Rutilus caspicus ), bream ( Abramis brama ) and pike-perch ( Sander lucioperca ) in the water area of the Western part of the Northern Caspian Sea in September-October 2012-2016. Roach and bream fingerlings, that are the largest part of anadromous fishes of the Volga-Caspian fishery basin, predominate in catches of minnow trawls. Theirs total share is 85.9-99.6%. Weight density of pike-perch is not so great - 0.2-2.0%. Level of yield of roach, bream, pike-perch fingerlings in the Northern Caspian Sea varies from year to year (roach 4.5-7 mln, bream 4.0-12.9 mln, pike-perch 0.030-0.163 mln specimens) and determined by abiotic and biotic complex of factors, the general of which is the water content of the Volga river in the flood-time period. The number of young fishes increases in the period with high level of flowing, in low flowing times it decreases. The most favorable conditions for fish reproduction were in high-water periods in 2013 and 2016, and least favorable - in extremely law water periods in 2015. The maximum number of bream fingerlings reached in 2013, roach - in 2012 and 2013, bream - in 2016. The minimum number of all three fish species was noted in 2015. By the results of researches of bream breed, years 2012, 2013 and 2016 are considered not so great yielding years; years 2014 and 2015 are low-yield years. The breed of roach and bream from 2012 to 2016 are estimated like low yield years, which was determined not only due to low water level of the Volga river, but because of a decrease of the population number of these fish species and breeding population on breeding grounds.

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STATE OF POPULATION OF PIKE PERCH OF THE LOWER FLOW OF THE URAL RIVER

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2018-4-83-89 ◽

2018 ◽

pp. 83-89

Author(s):

Sergey Vladimirovich Kuzmenko ◽

Arkadii Fedorovich Sokolsky ◽

Alexander Nickolaevich Nevalennyy ◽

Nikolay Nikolayevich Popov

Keyword(s):

Caspian Sea ◽

Fishing Ground ◽

Commercial Fishing ◽

The Caspian Sea ◽

Foreign Markets ◽

North East ◽

The North ◽

Pike Perch ◽

Exploration And Production ◽

Commercial Species

In domestic and foreign markets a great demand for pike perch is caused by the fact that its meat is a digestible and dietetic product. Due to growing scales of exploration and production of oil, as well as of poaching in the last years pikeperch and other species suffer from anthropogenic load. In 1990 spike perch catches reached 4.49.000 tons and made 1/3 of total catch of semi anadromous and river fish. During the last decade pike perch catches have decreased in the Ural-Caspian region up to 380 t, according to data of 2016. The study of pike perch populations on fishing zones of the Ural (delta, Malaya Dambinskaya fishing ground) covered the data obtained in 2010-2016. There have been studied migrating periods of pike perch to the spawning grounds. Since 2011 there has been stated a drastic decrease of sire number and a much less catch of pike perch per one casting in autumn, which was caused by the permission for fishing in the coastal part of the Caspian Sea. According to the research data, there have been given size-weight parameters of pike-perch producers in the Ural river during 10 years (2006-2016). The tendency to juvenation of spawning pike perch species is stated due to increasing share of the first spawning species, as well as due to decreasing number of male species in the catches as their age increased. Fultin and Clark’s condition coefficients are shown. Importance of pike perch as a commercial species in the ecosystem of the Ural-Caspian fishery zone contributes to define the following recommendations on saving and restoring pike perch population: to reduce commercial catches in the estuarine area of the Ural; to forbid commercial fishing in the coastal area of the north-east part of the Caspian Sea; to intensify fishery inspection in the Urals.

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TSUNAMI HAZARD ASSESSMENT IN THE CASPIAN SEA

Journal of Oceanological Research ◽

10.29006/1564-2291.jor-2019.47(5).6 ◽

2019 ◽

Vol 47 (5) ◽

pp. 74-88

Author(s):

E. A. Kulikov ◽

A. Yu. Medvedeva ◽

I. V. Fine

Keyword(s):

Hazard Assessment ◽

Caspian Sea ◽

Water Area ◽

Tsunami Hazard ◽

Estimation Of Parameters ◽

The Caspian Sea ◽

Tsunami Waves ◽

The North ◽

Tsunami Hazard Assessment ◽

Run Up

The article describes the tsunami hazard assessment for the coast of the Caspian Sea, in particular for the Absheron Peninsula. Due to the high socio-economic load on the coast of this region by electric power and oil production industries requirements, it is necessary to take into account risks even for such extremely rare natural phenomena like tsunamis. An earthquake with M = 8 ± 0.2 can occur throughout the Caspian Sea region, including land, once every 216 years, while for the water area the frequency of occurrence of such an event is 1620 years. The article presents the results of a tsunami hazard assessment based on a deterministic approach for the Absheron Peninsula. This approach of the tsunami hazard assessing of an arbitrary part of the coast consists of selecting of the strongest observed (or hypothetical) tsunami event from a neighborhood and from a distant zone, of the subsequent estimation of parameters for model sources and, finally, of the numerical modeling of tsunami generation and propagation from these sources. It was obtained that with the propagation of tsunami waves from the north to the coast of the Absheron Peninsula, its height can reach 3‒4 m for some parts of the coast with run-up 500‒1500 m.

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RESULTS OF THE STUDY ORIBATIDMITEIN THE COASTAL AREA OF THE NORTH-WEST OF THE CASPIAN SEA

South of Russia ecology development ◽

10.18470/1992-1098-2014-3-158-161 ◽

2015 ◽

pp. 158

Author(s):

A. A. Grikurova ◽

E. Z. Davudova ◽

L. S. Subias ◽

U. Ja. Shtanchaeva

Keyword(s):

Coastal Area ◽

Caspian Sea ◽

The Caspian Sea ◽

North West ◽

The North

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STATE OF FISHERIES IN SOUTH REGION OF VOLGO-CASPIAN FISHERIES BASIN

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2021-3-7-16 ◽

2021 ◽

Vol 2021 (3) ◽

pp. 7-17

Author(s):

Pavel Aleksandrovich Balykin ◽

Raisa Pavlovna Khodorevskaya

Keyword(s):

Annual Runoff ◽

Southern Region ◽

The Caspian Sea ◽

Volga River ◽

Total Allowable Catch ◽

Fish Resources ◽

The North ◽

Current State ◽

Pike Perch ◽

North Western

The paper presents the generalized materials on the current state of fisheries in the Northern part of the Caspian Sea (southern region of the Volga-Caspian fisheries basin). It is shown that catches in the North-Western and Tersk-Caspian subdistricts varied in the opposite way: an increase in production in one subdistrict was accompanied by a decrease in the other. The decreasing or increasing catches is due to semi-anadromous (roach, brim, zander, carp) and freshwaterfish species (cat-fish, pike-perch, small size ordinary fish). There have been found the significant relationships between the size of catches in the North-Western and Tersk-Caspian subdistricts with the annual runoff and the volume of spring flooding of the Volga river, which allows to conclude that fish resources are redistributed between these regions depending on the natural conditions of a particular year. In order to more fully develop the fish resources of the southern region of the Volga-Caspian fisheries basin, it is recommended to abandon the division of quotas into parts for the North-Western and Tersk-Caspian subdistricts and to allow the fishing organizations to work at the expense of the total allowable catch

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DISTRIBUTION OF CASPIAN SPRATS IN THE NORTH-WESTERN PART OF THE CASPIAN SEA (BASED ON RESULTS OF HYDROACOUSTIC RESEARCH IN NOVEMBER 2018)

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2019-3-41-50 ◽

2019 ◽

pp. 41-50

Author(s):

Tatiana Vasilievna Pomogaeva

Keyword(s):

Caspian Sea ◽

Water Surface ◽

Bottom Layer ◽

Water Area ◽

Middle Part ◽

Average Density ◽

Layer By Layer ◽

The Caspian Sea ◽

The North ◽

Study Results

Since Caspian sprat today is a reserve fishery object, hydroacoustic studies are the main purpose of solving the problem of estimating concentrations, areas and terms of the organization of the Russian marine fishery. A promising fishing area is the region of the middle part of the Caspian Sea, off the Dagestan coast, which has been studied since 2011. As it was found during previous studies, the densest sprat schools form in the autumn period in the bottom layer. The present research focuses on Caspian sprat distribution in the western part of the Middle Caspian in November 2018. Hydroacoustic tacks covered a water area of 630 NM. The echo recordings of hydroacoustic surveys covering the water area at the depths 20-60 m were analyzed. The recordings were studied considering the response of sprat to the day and night light. Processing of hydroacoustic data was carried out in several stages: analytical viewing of echograms purposed to identify specific features of sprat; recording minimum and maximum values of echo intensity depending on the depth; data post-processing in SIMRAD BI-60 program. The distribution of Caspian sprats is represented totally from the water surface to the ground, and layer by layer, in layers of 10 meters from the water surface. It has been stated that in the surface layer there are practically no sprat schools. The maximum value of the average density (8.7 t / mile2) was registered in the bottom layer (40-50 m). The study results can be used in organization of Russian sprats fishing in the Caspian Sea.

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DYNAMICS OF ZOOBENTHOS DEVELOPMENT WITHIN THE WATER AREA OF THE YURI KORCHAGIN FIELD IN THE NORT PART OF THE CASPIAN SEA

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2018-2-89-97 ◽

2018 ◽

pp. 89-97

Author(s):

Semen Nikolaevich Studnikov ◽

Lyubov Vasilievna Malinovskaya ◽

Alexey Vladimirovich Kuzin

Keyword(s):

Population Density ◽

Benthic Invertebrates ◽

Caspian Sea ◽

Water Area ◽

The Caspian Sea ◽

Survey Period ◽

Gas Field ◽

Field Development ◽

The North ◽

North Part

One of the main purposes of the monitoring studies is a long-term research of benthic communities of the north part of the Caspian Sea. Analysis of quantitative and qualitative characteristics is the only means to formulate main laws of the development of benthic biocenosis in terms of enhanced oil and gas field development, as well as to provide a forecast of the state of the fields and of the human impact on them. In the survey period, from 2014 to 2016, 43 species of benthic invertebrates, namely 2 species of Annelida, 32 species of Crustacea and 9 species of Mollusca, were identified as the result of zoobenthos development study. In that period, total average population density of the benthic fauna within the Yuri Korchagin field water area made 6 716 organisms per square meter, while the general average biomass constituted 77.324 grams per square meter. During the whole period of the research such zoobenthos species as Crustaceans and mainly Gammarids, including Ch. Ischnus and St. similis , dominated in terms of population density. As to biomass, the most abundant zoobenthos species were molluscs - Mediterranean species M. lineatus and A. ovata with D. protracta - a marine species - dominating in different years. Zoobenthos diversity, quantity fluctuations and dominance of given species in biomass and population density at certain stations of the studied water area were linked principally to the water salinity, type of soil and food resources availability. The study of benthic invertebrates showed that Yuri Korchagin field area in the north part of the Caspian Sea is characterized by a high development of euryhaline and marine benthic invertebrates.

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