Recent Submissions

  • Aquatic Bioresources and Environment, vol. 5, issue 1

    Bragina, T.M. (Azov-Black Sea Branch of FSBSI VNIRO (AzNIIRKH)Rostov-on-Don, Russia, 2022)
    Vertical distribution of biogenic elements in Gelendzhik area in 2019 has been presented. Hydrochemical criteria for typification of the Azov limans of the Krasnodar Territory as the spawning grounds for semi-anadromous fish species have been enlisted. Use of the thermohaline method for determining the quasi-heterogeneity of the water masses in the Azov Sea is discussed. Age composition and linear growth of the invasive ark clam species (Anadara kagoshimensis (Tokunaga, 1906)) in the Kerch Strait have been estimated. Effect of different doses of pituitary hormone on the reproductive performance of shemaya females (Alburnus leobergi, Freyhof & Kottelat, 2007) has been studied. Heavy metals and arsenic in water, bottom sediments and Black Sea turbot (Scophthalmus maeoticus, Pall., 1814) in the Caucasian Shelf area in the Black Sea (1995–2020) have been traced. Exotic fish species off the Black Sea coast of the Krasnodar Territory are presented. Problems of using riverbed ponds in aquaculture (in the context of recent legislative changes) are considered.
  • Problems of using riverbed ponds in aquaculture (in the context of recent legislative changes)

    Sennikov, S.A. (2022)
    For a long time in the field of aquaculture existed the uncertainty, associated with the use of the ponds formed by water-retaining structures on watercourses (the so-called “riverbed ponds”), despite numerous attempts to resolve emerging contradictions legislatively—including another such attempt made last year by the adoption of Federal Law No. 163-FZ of June 11, 2021 “On the amendment of the Federal Law “On aquaculture (fish farming) and amendment of some legislative acts of the Russian Federation” and some legislative acts of Russian Federation”. The amendments introduced by this law establish new legal mechanisms for the use of riverbed ponds for the purposes of pond aquaculture, which makes their study particularly relevant. However, it will not be possible to fully understand the essence of these legislative changes without understanding the history and development of the legal framework applicable to these water bodies. In this regard, this article shows how riverbed ponds through numerous legislative changes were gradually introduced into the property circulation and how the principle of separation of the water resources of riverbed ponds and the land under them appeared, which means that the water in such ponds remains federal, but the land under them may be in other forms of ownership. This article also discusses the questions of the correlation of this principle with other principles of the legal regulation underlying water and land legislation, and how it is perceived by judicial practice. The author analyzed in detail the amendments, adopted by Federal Law of 11.06.2021 No. 163-FZ, concerning the regulation of riverbed ponds, proposed a classification of the legal basis for the use of water bodies in fish farming, and concluded what problems in the use of riverbed ponds remained, despite recent legislation attempts to eliminate them. Finally, this article suggests directions for further changes, according to which, as it seems to the author, the legislator could go to solve the identified problems.
  • Exotic fish species off the Black Sea coast of the Krasnodar Territory

    Nadolinsky, V.P. (2022)
    Each species strives to expand its range and spreads in all directions. Its expansion occurs in the direction where biological and abiotic factors are similar to its native habitat. Entering the area with different conditions activates the mechanism of adaptation to new conditions. If such an adaptation is successful, the range of this species expands in this direction, otherwise this area remains unclaimed. Possible migration routes of exotic species run along the coast of Turkey through the coast of the Republic of Georgia or along the coasts of Bulgaria, Romania and the Crimean Peninsula. Taking into account the existing system of currents in the sea, the most likely option seems to be their invasion into the Russian sector of the Black Sea as a result of migration from the Sea of Marmara through the Bosphorus Strait and further along the direction of the Anatolian and Caucasian currents. Another way is with ballast water. In 1995–2014, 7 monitoring stations under the authority of AzNIIRKH operated near the Black Sea coast of the Krasnodar Territory on a year-round basis. They were equipped with all the necessary types of fishing gear (set nets with a mesh size from 25 to 200 mm, bottom set nets with a minimum mesh size of 6.5 and 10 mm, cast nets with 30 mm mesh, etc.). AzNIIRKH-trained observers were present at each haul of the fishing gear and conducted the necessary catch analyses. All unusual species were preserved by freezing or taxidermy and transferred to the institute. As a result of the operation of AzNIIRKH monitoring stations, in the catches of commercial fishing gear off the Black Sea coast of the Krasnodar Territory in 2005 and 2012, two exotic species have been recorded: Siganus luridus (Rüppell, 1828) and Lophius piscatorius Linnaeus, 1758.
  • Heavy metals and arsenic in water, bottom sediments and Black Sea turbot (Scophthalmus maeoticus, Pall., 1814) in the Caucasian Shelf area in the Black Sea (1995–2020)

    Korablina, I.V.; Gevorkyan, Zh.V.; Gorgola, L.G.; Barabashin, T.O. (2022)
    The results of investigation of the pollution of the water and bottom sediments of the Caucasian Shelf in the Black Sea by heavy metals (copper, zinc, lead, cadmium, mercury) and arsenic, as well as their content in the Black Sea turbot Scophthalmus maeoticus (Pallas, 1814) are presented for 1995–2020. In the water and turbot, the determination of Zn, Cu, Pb, As, and Cd has been conducted using the method of atomic absorption with electrothermal atomization; mercury in all components of the ecosystems was measured using the method of atomic absorption with “cold steam”; in the bottom sediments, the content of Zn, Cu, Pb and As was identified using X-ray fluorescence method. In 1995–2020, in some water samples, the concentrations of zinc, copper and mercury exceeded the maximum permissible level established for the water bodies of fisheries importance, while the lead and cadmium were below it. The arsenic content during the entire observation period was extremely low. A noticeable decrease in the concentrations of zinc, lead and copper in the shelf waters of the Black Sea in the present period as compared with the years of the greatest pollution (1995–2002) was recorded. In the bottom sediments, the content of lead, zinc and mercury exceeded their content in the earth's crust for several years; for arsenic, the excess was recorded throughout the entire observation period. This mostly results from the peculiarities of the granulometric composition of the shelf bottom and, to a much lesser extent, from anthropogenic influence. The differences in the bioaccumulation of heavy metals and arsenic in the organs of the Black Sea turbot are shown. Out of the identified elements, only lead, mercury and arsenic in isolated cases exceeded the permissible level in the organs of the turbot in some years.
  • Effect of different doses of pituitary hormone on the reproductive performance of shemaya females (Alburnus leobergi, Freyhof & Kottelat, 2007)

    Golovko, G.V. (2022)
    The stage of obtaining high-quality gonads was explored in the course of development of the biotechnology for artificial reproduction of the anadromous Azov-Black Sea shemaya Alburnus leobergi (Freyhof & Kottelat, 2007), a valuable species of the Azov Sea ichthyofauna. This research is aimed at the assessment of the maturity status of shemaya females and males after their wintering in the ponds of a fish farm on the Lower Don at a thermal constant of 849 degree days (DD) and at the evaluation of the reproductive parameters of shemaya females exposed to different doses of the pituitary extract. In all literary sources available, the information on this topic has been scarce and fragmentary, and in the foreign sources, it was entirely absent. Our investigation has shown that the gonads of 55 % of males were at 5th and 5th–6th stages of maturity. At the same time, females significantly differed by the degree of gonad maturity: 26.0 % of females had first-generation eggs at different stages of resorption, the sexual products of 15.8 % of females were at the 5th stage of maturity, and 58.2 % of females had immature sexual products at the 3rd–4th and 4th stages of maturity. The investigation of the effect of two doses (6.0 and 9.0 mg/kg) of the pituitary gland extract with application of the fractional method showed that 15.0 % and 16.7 % of injected shemaya females with the most mature eggs responded to the preliminary dose of the pituitary extract by ovulation of physiologically sound eggs (0.6 and 0.9 mg/kg, respectively). 20.0 % and 6.7 % of females responded to the provoking dose of pituitary hormone by ovulating physiologically high-quality eggs in accordance with the concentration applied. The fertilization rate of physiologically sound eggs in both scenarios had similar values (97.4 and 97.9 %). Since the thermal constant of 849 DD is excessive for the start of artificial reproduction of the Azov-Black Sea shemaya, it is necessary to conduct research in order to identify the thermal constant precluding the loss of the first-generation eggs caused by the incipient processes of resorption.
  • Age composition and linear growth of the invasive ark clam species (Anadara kagoshimensis (Tokunaga, 1906)) in the Kerch Strait

    Zhavoronkova, A.M.; Sytnik, N.A.; Zolotnitskiy, A.P. (2022)
    Age composition and linear growth rate in the ark clam (Anadara kagoshimensis) population in the Kerch Strait are investigated. Based on the analysis of seasonal annual growth rings and chevron grooves on the hinge ligament of the ark clam, the age of this species has been examined, which, in this population, was found to be 7 years (6+). Based on the age and annual length gain of the molluscs in the course of their ontogenesis, a theoretical growth curve is presented; it has been calculated following the von Bertalanffy growth equation, where L∞, k, and t are the parameters equaling to 50.2, 0.428, and 0.022, respectively. The highest growth rate was observed in the first year of life, 17 mm; however, later on, it was consistently decreasing and did not exceed 2 mm/year in the oldest individuals. The relationship between the ark clam’s growth rate (PL) and its length, approximated by the inverse linear function is presented. Based on the parameters of the von Bertalanffy growth equation, a theoretical maximum age of the investigated species has been calculated; it was found to be 8.74 years. It has been shown that the linear growth rate of the ark clam in various areas of the Azov and Black Sea Basin is determined by the water salinity to a considerable extent, because in the desalinated areas (Azov Sea, Kerch Strait, Danube River Delta and Northwestern Black Sea with 10–14 ‰ salinity), the growth rate of this mollusc was 1.5–2 times lower than in the Southeastern Black Sea (18 ‰).
  • Use of the thermohaline method for determining the quasi-heterogeneity of the water masses in the Azov Sea

    Shishkin, V.M.; Zhukova, S.V.; Karmanov, V.G.; Lutynskaya, L.A.; Burlachko, D.S.; Podmareva, T.I.; Taradina, E.A. (2022)
    This paper considers the possibility of applying the thermohaline method (using the construction of T,S-diagrams) to determine the quasi-heterogeneity of water layers in the Azov Sea drawing on the expedition data obtained in 2016–2020. The diagrams allowing to identify a two-layer water structure in the aquatic environment of the Azov Sea (excluding the area of Taganrog Bay) have been constructed. The analysis of water stratification in the conditions close to the natural regime of the sea (thus, including salinity), as well as in the present conditions of its salinization, has been carried out. The data obtained through the analysis of sample observations have been verified with mathematical methods; the explanations from the standpoint of T,S-analysis of the aquatic environment have been presented. The hydrological features of the salt regime of the Azov Sea are given with the specification of the situations during the advection of the Black Sea waters, which precondition a stable separation of the waters in the southern part of the sea into surface and bottom “water masses”. These possibilities are justified mathematically, and for the modern period of considerable salinization of the sea, in accordance with the theory of T,S-analysis of water masses, a classification assessment of the aquatic environment is proposed.
  • Hydrochemical criteria for typification of the Azov limans of the Krasnodar Territory as the spawning grounds for semi-anadromous fish species

    Kosenko, Yu.V.; Barabashin, T.O.; Shevtsova, E.A.; Poroshina, E.A.; Belousov, V.N.; Kartamysheva, T.B.; Glubokov, A.I. (2022)
    The Azov limans of the Krasnodar Territory are of major fishery importance, as they serve as the spawning grounds for valuable semi-anadromous fish species. Roach and zander at their early stages of development are highly susceptible to the negative effects of various abiotic environmental factors, which makes them very dependent on the hydrochemical status of the water bodies during the spawning season. As the hydrochemical regime, in turn, closely depends on the hydrological regime and the overgrowth area of the limans, it can be used as a criterion parameter that affects the success of spawning of the semi-anadromous fish species and growth of their juveniles. This paper proposes a system of hydrochemical scoring and establishes the criteria for the typification of the limans based on their suitability for spawning and growing of zander and roach following the data collected in the spring season of 2017–2021. Based on the analysis of the hydrochemical data, 3 main blocks for the typification of limans according to their suitability for spawning of semi-anadromous fish species were identified: gas conditions, ionic composition and the content of biogenic components in water along with an assessment of the primary production of phytoplankton. It has been found out that the Azov limans of the Krasnodar Territory vary significantly in terms of the hydrochemical composition of their water. Some limans are characterized by pronounced fluctuations of the hydrochemical and ichthyological characteristics in interannual dynamics. Based on the hydrochemical criteria, the limans of the Kulikov-Ordynsk group (Bolshoy Bashtovy, Donchikov, Bolshoy Grushchany) and the Kulikovskiy Liman were the most favorable for the spawning of zander and roach, and the Ryasnoy, Boykievskiy and Kurchanskiy Limans were the least favorable. The low production coefficient in the water of most limans can be indicative of their high degree of overgrowth with macrophytes, which control is crucial in increasing the efficiency of natural reproduction of semi-anadromous fish species. The correlation between the criterion scoring of the limans based on the hydrochemical regime and the density of distribution of zander and roach juveniles has been established, which confirms the validity of this study.
  • Vertical distribution of biogenic elements in Gelendzhik area in 2019

    Borodulina, P.A.; Chasovnikov, V.K.; Fedorov, A.V. (2022)
    Investigation of the vertical distribution of nutrients is an important component in studying the entire ecosystem of the Black Sea. Biogenic elements play a crucial role in the primary production in the sea coastal zone and are among the main indicators of the ecological state of marine waters. Any changes in nutrient regime are reflected in biological marine plankton communities. This work was aimed at the investigation of the seasonal vertical dynamics of biogenic elements in the northeastern part of the Black Sea near the city of Gelendzhik in 2019. To determine concentration of nutrients, the methods standard to the practice of marine hydrochemical studies have been used. As a result of this investigation, it has been found that nitrate and ammonium forms of nitrogen, and mineral phosphorus have well-defined concentration maxima that correspond to certain values of conditional density. There is one deep maximum in the vertical distribution of nitrates; on average, the concentration of nitrate nitrogen is 5.57 μmol/L. Vertical profile of phosphates has an upper maximum (average concentration of 1.39 μmol/L), a minimum (1.19 μmol/L) and a lower maximum (6.64 μmol/L) of concentrations. Seasonal changes in climatic conditions, coastal runoff and rate of phytoplankton consumption determine the dynamics of nutrient concentrations in the photic layer of marine waters.
  • Водные биоресурсы и среда обитания. Том 4, вып. 4

    Bragina, T.M. (Azov-Black Sea Branch of the FSBSI “VNIRO” (“AZNIIRKH”)Rostov-on-Don, Russia, 2021)
    GIS technology in the investigation of morphometric characteristics of the wintering pits in the Upper Reach of the Tsimlyansk Reservoir has been applied. Amphipods of the marine farms in Sevastopol coastal waters (Black Sea) have been investigated. New data on finding of alien prawn Macrobrachium nipponense (Decapoda, Palaemonidae) in the Don River (Azov Sea Basin) have been presented. Ichthyoplankton of the Russian territorial waters and exclusive economic zone in the Black Sea has been studied. Parasite fauna of the common carp (Cyprinus carpio Linnaeus, 1758) juveniles in the growing ponds of the Azov and Black Sea Fishery Basin has been identified. Comparative analysis of fishing conditions for the Azov Sea anchovy in September–November, 2019 and 2020 has been made.
  • On the announcement of the III International Scientific and Practical Conference “Biological Diversity: Study, Conservation, Restoration, Rational Use”, held on September 13–18, 2022 (Kerch State Maritime Technological University, Kerch, Russia)

    Azov-Black Sea Branch of VNIRO (2021)
    ОСНОВНЫЕ ТЕМАТИЧЕСКИЕ НАПРАВЛЕНИЯ: 1. Фундаментальная биология. 2. Наземные экосистемы. 3. Водные экосистемы. 4. Экологическое воспитание и образование. 5. Биоразнообразие и благополучие населения.
  • Results of the comparative analysis of fishing conditions for the Azov Sea anchovy in September–November, 2019 and 2020

    Panov, B.N.; Smirnov, S.S.; Spiridonova, E.O.; Negoda, S.A.; Trusova, K.T. (2021)
    The data on the stock and abundance of the European anchovy, its age, length, and weight characteristics, and the information on its distribution in the sea before the start of its fishing season have been considered. Abiotic environmental conditions of anchovy autumn migration have been monitored using daily indicators of atmospheric transfers in the area, as well as temperature and sea surface level (altimetry) at various locations of the Kerch pre-strait zones of the Azov and Black Seas from September 20 to November 20. In October 2020, the Azov Sea anchovy was in a better physiological state than in 2019, even though its stock remained virtually the same. Its fishing in the Black Sea in 2019 started early, lasted long, and was low-efficient; in 2020, on the contrary, it was late, short, and productive. Favorable conditions for the start of anchovy fishing in the Azov Sea were created by the northwestern atmospheric transfers and southeastern surface currents in the pre-strait zone of the Azov Sea, and the northern atmospheric transfers and southern surface currents in the Kerch Strait were more favorable for the anchovy migration to the Black Sea. Anchovy fishing in the Azov Sea started at the sea surface temperature 17.0–17.5 °C, and its large-scale fishing in the Black Sea started at 16 °C. In the Kerch pre-strait zone of the Black Sea, the predominance of eastern geostrophic currents facilitates the migration of the Azov Sea anchovy to the Caucasian coast. The strengthening of these currents facilitates the anchovy migration and reduces the effectiveness of its fishing, and their weakening exerts an adverse impact on its migration but increases the effectiveness of its fishing.
  • Parasite fauna of the common carp (Cyprinus carpio Linnaeus, 1758) juveniles in the growing ponds of the Azov and Black Sea Fishery Basin

    Khorosheltseva, V.N.; Strizhakova, T.V.; Kerimova, A.A.; Denisova, T.V. (2021)
    Fish farms located in the Azov and Black Sea Basin contribute greatly to the development of the fisheries and aquaculture in the Russian Federation. Here, the main cultivation targets are carp species, especially common carp (Cyprinus carpio Linnaeus, 1758). This work is aimed at the updating of the data on the current composition of the parasite fauna of the common carp from the rearing ponds of the Azov and Black Sea Fishery Basin. At the early stages of post-embryonic development, carp juveniles are exposed to parasite infestation both with a direct life cycle (before their transition to exogenous feeding) and with a complex life cycle (upon feeding on zooplankton organisms and benthos). At the investigated fish farms, the range of parasites in the carp juveniles covered 16 species from 5 classes: Peritricha (Trichodina sp. Ehrenberg, 1830), Monogenea (Dactylogyrus extensus Mueller et Van Cleave, 1932, Dactylogyrus sp. Mueller et Van Cleave, 1932, Gyrodactylus sp. Mueller et Van Cleave, 1932), Trematoda (Diplostomum sp. met. Nordmann, 1832, Posthodiplostomum cuticola met. Nordmann, 1832, Tylodelphys clavata met. Nordmann, 1832), Nematoda (Nematoda sp. l. Rudolphi, 1808, Spiroxys contortus l. Rudolphi, 1819), Cestoda (Bothriocephalus acheilognathi Yamaguti, 1934, B. opsariichthydis Yamaguti, 1934, Khawia sinensis Hsü, 1935, Neogryporhynchus cheilancristrotus Wedl, 1855, Paradilepis scolecina Rudolphi, 1819) and Crustacea (Lernaea elegans Leigh-Sharpe, 1925, Ergasilus sieboldi Nordmann, 1832). A considerable share (31.25 %) of the total number of parasites detected was comprised of the representatives of Cestoda class, found in four farms out of five investigated. Infestation rates for most parasite species were low, except for the Asian tapeworm Bothriocephalus acheilognathi.
  • Ichthyoplankton of the Russian territorial waters and exclusive economic zone in the Black Sea

    Nadolinsky, V.P.; Patyuk, V.V.; Efanov, A.D. (2021)
    Survival rate of a generation at the embryonic and larval stages of the life cycle plays a crucial role in the formation of fish stocks. The data on the distribution of the fish individuals at the early stages of their development allow for the mitigation of anthropogenic negative impact on the stocks of aquatic living resources. This study has been aimed at the investigation of the species composition and abundance of thermophilic and psychrophilic fish species at the early stages of their development in the Russian territorial waters and exclusive economic zone in the Black Sea, as well as the assessment of their status in these areas. Sampling was conducted using a cone-shaped ichthyoplankton net with 80 cm diameter opening (IKS-80), off the board of the vessel going through the circling motion at 3 knot speed for 10 minutes. In the summer season, the major share of the individuals caught at their embryonic stages of development is comprised by the European anchovy, red mullet, Atlantic horse mackerel, and annular seabream eggs. Among early juveniles, the larvae of gobies, blennies, and pipefishes prevail. It has been found out that the highest diversity of the fish species at their early stages of development is recorded in the summer season: 58 species in the territorial waters, and 14 species in the exclusive economic zone. Winter ichthyoplankton is not very diverse—only 4 species have been recorded. In the territorial waters, littoral fish species at their early stages of development prevail. Ichthyoplankton catches in the exclusive economic zone are mostly comprised by pelagic zooplanktivorous and pelagic carnivorous species. In the winter ichthyoplankton catches, both in the territorial waters and in the exclusive economic zone, eggs and early juveniles of 4 fish species are recorded: European sprat (eggs and larvae), whiting (eggs and larvae), shore rockling (larvae), and sand lance (larvae). Low species diversity of the ichthyoplankton during the winter season results from the low number of winter-spawning species.
  • New data on finding of alien prawn Macrobrachium nipponense (Decapoda, Palaemonidae) in the Don River (Azov Sea Basin)

    Zhivoglyadova, L.A.; Nebesikhina, N.A.; Elfimova, N.S.; Afanasyev, D.F. (2021)
    For the first time, a freshwater prawn of the genus Macrobrachium Spence Bate, 1868, earlier unknown for the basin of the Azov Sea, was recorded in the lower reaches of the Don River in September, 2019. Based on their morphological characteristics, the found specimens were identified as M. nipponense (De Haan, 1849). This work presents the results of genetic analysis confirming the species status of the prawn, and also reports on new discovery and spreading of this species in the Don River. Oriental river prawn M. nipponense is a subtropical species, in its natural range widespread in Southeast Asia. Since the middle of the 1960s, this species is rapidly expanding its range in Eurasia. In a temperate climatic zone within the area of the former USSR, this thermophilic species was introduced in cooling ponds of thermal power plants (TPP). Acclimatization of M. nipponense was carried out as a part of warm-water aquaculture in order to improve the food supply of fish and enrich the fauna of TPP cooling ponds. This paper summarizes the available information about the formation of stable populations of M. nipponense within the area of the former USSR countries, as well as an assessment of the risks of invasion in the Don River.
  • Amphipods of the marine farms in Sevastopol coastal waters (Black Sea)

    Grintsov, V.A.; Shchurov, S.V. (2021)
    Amphipods are one of the main taxa of invertebrates inhabiting the structures of marine farms. On the collectors of oyster and mussel farms in the Black Sea, their density reaches more than 200,000 ind.·m2 of the projected surface of the substrate. Amphipods, being a valuable food source for a number of fish and invertebrate species, as well as a consumer of organic matter, can increase the productivity of the Black Sea coastal waters. This work is aimed at the evaluation of the qualitative and quantitative characteristics of amphipods, as well as their biodiversity on the collectors of marine farms. To assess the species composition, biodiversity, and density of amphipods, standard methods have been used; the density was calculated per m2 of the projected surface of the substrate, based on the geometry of the marine farm components. 17 species of amphipods have been identified on the marine farm components, the most abundant of them being Jassa marmorata Holmes, 1905, Stenothoe monoculoides (Montagu, 1813), and Microdeutopus gryllotalpa Costa, 1853. The total density of amphipods in one sample on the farm structures reached 211,919 ind.·m2 of the projected surface of the substrate. The components of marine farms can facilitate the increase in the biodiversity and improve the quantitative characteristics of amphipods, which would result in the growth of the productivity rates of the Black Sea coastal waters.
  • Assessment of overgrowth of the Chelbas group of the Azov Sea Limans with aquatic vegetation

    Bondarenko, L.G.; Kulba, S.N.; Petrashov, V.I.; Smirnov, S.S.; Matveeva, E.I.; Rudakova, N.A. (2021)
    The Chelbas Limans play crucial role in the reproduction of semi-anadromous fish species. The efficiency of their spawning is closely related to the overgrowth of spawning grounds, therefore, the study of aquatic vegetation in the limans is essential for fisheries. This study is aimed at the investigation of the area and intensity of overgrowth of the Chelbas Limans with aquatic vegetation using remote sensing and GIS technologies. The materials on the dynamics of overgrowth of the Azov Sea limans belonging to the Chelbas group are presented for the period 2016–2021. The assessment of the overgrowth of these water bodies was carried out using the Modified Normalized Difference Water Index (MNDWI) and the radiometric Normalized Difference Vegetation Index (NDVI), which were calculated from the multispectral images of the European Space Agency Sentinel-2 satellite. The data of satellite remote sensing have been compared with the data of botanical surveys and visual observations. The area of overgrowth with aquatic vegetation in the Kushchevaty Liman varied within the range from 15 to 93 %, in the Gorkiy Liman it ranged within 12–65 %, and in the Sladkiy Liman the overgrowth area did not exceed 1.7 %. A four-level classification of the overgrowth of the water bodies according to the NDVI is proposed: class 0 is from -1.0 to -0.1, class 1 is from -0.1 to 0.3, class 2 is from 0.3 to 0.5, and class 3 is from 0.5 to 1.0. Examination of the aquatic vegetation in the Chelbas Limans has shown the dependence of the area of overgrowth of these water bodies with macrophytes on the regime of freshwater and seawater influx to the limans.
  • Application of GIS technology in the investigation of morphometric characteristics of the wintering pits in the Upper Reach of the Tsimlyansk Reservoir

    Kochetkova, A.I.; Bryzgalina, E.S. (2021)
    The shallow waters of the Upper Reach are the most productive natural spawning grounds in the Tsimlyansk Reservoir. The hydrological regime of the Upper Reach is of a channel type, which results in a high flow rate and contributes to the formation of deep-water areas and shallow-water ones (riffles) along the channel. In turn, deep-water areas play a key role in the preservation of aquatic biological resources during the most unfavorable periods of the year. This work was aimed at the comprehensive morphological investigation of the wintering pits in the Upper Reach of the Tsimlyansk Reservoir in 2019, as well as at the analysis of the materials collected in its course. This article presents the data collected during the bathymetric survey of the wintering pits in the Upper Reach of the Tsimlyansk Reservoir; using GIS, the morphometric characteristics of seven wintering pits have been calculated, and three-dimensional models of the bottom relief of these wintering pits have been created. During this investigation, three new wintering pits — Kalachevskaya, Lipo-Lebedenovskaya, and a pit in the vicinity of khutor Peskovatka — have been identified. A comprehensive analysis of the collected data indicates that the most pronounced in terms of the bottom topography wintering pits are Kalachevskaya, Golubinskaya, Nabatovskaya, and Peskovatskaya.
  • Current state of the habitat of commercial invertebrates in the hypersaline lakes of Crimea

    Borovskaya, R.V.; Zhugaylo, S.S.; Pugach, M.N.; Adzhiumerov, E.N.; Krivoguz, D.O. (2020)
    Hydrological and hydrochemical conditions in the hypersaline water bodies of Eupatorian, Tarkhankut, Perekopsk, and Kerch groups of lakes were investigated. Fisheries value of these lakes lies in providing the habitat for such fishing targets as brine shrimps (Artemia) and chironomids. As the main source of primary empirical data, findings of the expeditions conducted in the spring, summer and autumn seasons of 2017–2019 have been used. As a result, it has been found out that, in general, abiotic environmental factors in the majority of the lakes in the spring – autumn season were adequate for development of the aquatic living organisms inhabiting them. It was supported by positive hyrdobiological developmental indices of these species and indicated their high adaptability to the existing state of their habitat, in particular, saline and oxygen regimens. However, the autumn season of 2017 was unfavorable for most of the lakes in terms of development of the aquatic living organisms. Substantial increase in salinity led to the depression of brine shrimp populations and to the death of chironomids. A fairly high content of mercury in some hypersaline water bodies located in the Western and Northern Crimea also comes under notice. In the case of Aygul Lake, it is associated with proximity of chemical enterprises; however, the sources of polluting substances in the other investigated water bodies at present remain unknown and require further investigation.
  • Hydrological and hydrochemical criteria for typification of the water bodies aimed for development of commercial aquaculture in the southern and south-eastern parts of the Rostov Region

    Barabashin, T.O.; Kosenko, Yu.V.; Zhukova, S.V.; Belousov, V.N.; Korablina, I.V. (2020)
    This paper presents materials on the development of criteria for the typification of water bodies for the purposes of commercial aquaculture on the example of model water bodies in the Rostov Region. Altogether, 24 water bodies located in the southern and south-eastern parts of the Region have been investigated. The development of criteria for the typification of water bodies has been carried out based on hydrological and hydrochemical indicators, which were scored in 4 blocks. The total score established for the main hydrological and hydrochemical parameters can be used as a criterion for a water body being suitable for the purposes of commercial aquaculture. The dependence of suitability of the water body for fish farming on its location, the average annual flow rate of rivers or the annual precipitation–evaporation ratio according to the established scores has not been revealed. However, in the zone of very arid climate, more unusable water bodies have been identified. Since, according to the conditions of water availability, almost all water bodies should be classified as the reservoirs that are insecure for fish farming, the number of water bodies not recommended or recommended with significant restrictions amounted to only 25 % of the total. This indicates a fairly high potential for fish farming even in the arid zone of the Rostov Region. A brief hydrological and hydrochemical characterization of each investigated water body can be used to develop scientifically grounded recommendations for the organization of fish farms for the purposes of commercial aquaculture.

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