Marine Biological Journal <p>Морской биологический журнал Marine Biological Journal.</p> <div><em><strong>Launched in February 2016.</strong></em></div> <div><em><strong>Certificates of registration:</strong></em></div> <div>print version: <a href="" target="_blank" rel="noopener">ПИ № ФС 77 - 76872 of 24.09.2019</a>.</div> <div> <div><em><strong>Founder:</strong></em></div> <div>A.&nbsp;O.&nbsp;Kovalevsky Institute of Biology of the Southern Seas of&nbsp;RAS.</div> </div> <div><em><strong>Publishers</strong></em>:</div> <div><a href="" target="_blank" rel="noopener">A.&nbsp;O.&nbsp;Kovalevsky Institute of Biology of the Southern Seas of&nbsp;RAS</a>,</div> <div><a href="" target="_blank" rel="noopener">Zoological Institute of&nbsp;RAS</a>.</div> <div>ISSN 2499-9768 print, ISSN 2499-9776 online.</div> <div><em><strong>Languages:&nbsp;</strong></em>Russian, English.</div> <div><em><strong>Periodicity:</strong></em> four issues a&nbsp;year.</div> <div>&nbsp;</div> <div><strong>Authors do&nbsp;not need to&nbsp;pay an&nbsp;article-processing charge.</strong></div> <div>The payment of&nbsp;royalties is&nbsp;not&nbsp;provided.</div> <div>&nbsp;</div> <div>Author recieves one copy of&nbsp;printed version of&nbsp;the journal as&nbsp;well as&nbsp;.pdf file.</div> <div>&nbsp;</div> <div> <div class="siteorigin-widget-tinymce textwidget"> <p>Marine Biological Journal is&nbsp;an&nbsp;open access, peer reviewed (double-blind) journal. The journal publishes original&nbsp;articles as&nbsp;well as&nbsp;reviews and brief reports and notes focused on new data of&nbsp;theoretical and experimental research in&nbsp;the fields of&nbsp;marine biology, diversity of&nbsp;marine organisms and their populations and communities, patterns of&nbsp;distribution of&nbsp;animals and plants in&nbsp;the World Ocean, the&nbsp;results of&nbsp;a&nbsp;comprehensive studies of&nbsp;marine and oceanic ecosystems, anthropogenic impact on&nbsp;marine organisms and on&nbsp;the ecosystems.</p> <p>Intended audience: biologists, hydrobiologists, ecologists, radiobiologists, biophysicists, oceanologists, geographers, scientists of other related specialties, graduate students, and students of&nbsp;relevant scientific profiles.</p> <p>The subscription index in&nbsp;the “<a title="Russian Press MBJ" href="" target="_blank" rel="noopener">Russian Press</a>” catalogue is Е38872.</p> </div> </div> A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS, Sevastopol, Russian Federation en-US Marine Biological Journal 2499-9768 Ichthyofauna of the Black Sea coastal zone in the Laspi Bay area (Crimea) <p>The ongoing processes of the Black Sea salinization and fluctuations in mean annual temperature have already caused the natural dispersal of various representatives of the Mediterranean Basin and Indian Ocean fauna and led to a change in species composition and structure of fish communities, inhabiting the coastal zone of the Crimean Peninsula. As a result, it became necessary to study modern composition of fish fauna and indicators of its species richness and diversity. The Laspi Bay was chosen as a model polygon for the following reasons: relatively low level of anthropogenic load; the fact that its part belongs to the specially protected natural areas, as well as the absence of fishing activity with coastal fixed fishing gear; constant free entry of pelagic fish species; biotopes diversity; and smooth change in depth. These peculiarities of the Laspi Bay allow assessing the presence of fish from different ecological groups and provide conditions for monitoring. The study was carried out in the spring-autumn periods of 1990–1994 and 2017–2018. The material was sampled with net fishing gear, hook tackle, and traps. The nets were set at various depths both perpendicular and parallel to the shoreline during the day (10:00 to 18:00) and at nighttime (18:00 to 06:00). Visual observations were also carried out. In total, 70 fish species were registered. Out of them, 14 species were previously not recorded for this area; 5 of them [salema <em>Sarpa salpa</em> (Linnaeus, 1758), red-mouthed goby <em>Gobius cruentatus</em> Gmelin, 1789, Bath’s goby <em>Pomatoschistus bathi</em> Miller, 1982, mystery blenny <em>Parablennius incognitus</em> (Bath, 1968), and chestnut goby <em>Chromogobius quadrivittatus</em> (Steindachner, 1863)] are recent invaders, actively spreading in the Black Sea over the past 15–20 years only. Most of the analyzed species (64) are marine euryhaline fish. The brackish-water group is represented by three species, indigenous to the Black Sea: mushroom goby <em>Ponticola eurycephalus</em> (Kessler, 1874), round goby <em>Neogobius melanostomus</em> (Pallas, 1814), and knout goby <em>Mesogobius batrachocephalus</em> (Pallas, 1814). Out of anadromous fish, starry sturgeon <em>Acipenser stellatus</em> Pallas, 1771 is registered, as well as two Clupeidae species: Black Sea shad <em>Alosa tanaica</em> (Grimm, 1901) and Pontic shad <em>Alosa immaculata</em> Bennett, 1835. As established, the observed seasonal dynamics of species diversity indices within the studied water area is associated with fluctuations in the abundance of horse mackerel <em>Trachurus mediterraneus</em> (Steindachner, 1868). In April – May, when this species headed to shallow water for feeding and breeding, the indices have the lowest values; in August, when the abundance of horse mackerel decreases, the maximum values are observed.</p> E. R. Abliazov A. R. Boltachev E. P. Karpova A. N. Pashkov O. N. Danilyuk Copyright (c) 2021 A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS 2021-06-16 2021-06-16 6 2 3 17 10.21072/mbj.2021.06.2.01 Consorts of gastropod Rapana venosa (Valenciennes, 1846) in the northern Black Sea. Part V: Annelida (Polychaeta) <p>The study of Annelida (Polychaeta) taxocene – epibionts of the invasive gastropod <em>Rapana venosa</em> – continues the cycle of publications describing the composition of the consortium of the largest gastropod of the Black Sea benthos. <em>R. venosa</em> consortium is still a poorly investigated and unaccounted component in the structure of the Black Sea shelf biocenoses. The aim of this work is to study the complex of polychaetes of <em>R. venosa</em> consortium. The objectives of this stage are as follows: compiling a list of Annelida (Polychaeta) taxa – rapa whelk epibionts; studying taxocene biogeographic and trophic structure; and analyzing ecological relationships of polychaetes with the consortium core. To study the consort community of rapa whelk, sampling was conducted in seven areas of the northern Black Sea: 1 – Mamaia, Romania; 2 – northwestern Black Sea, Crimea offshore; 3 – Sevastopol; 4 – Alupka; 5 – Yalta – Alushta; 6 – Karadag; 7 – Kerch Strait. In the coastal area down to a depth of 15 m, <em>R. venosa</em> was sampled totally using surface-supplied diving equipment; in the deeper-water area (down to 40 m), samples were taken with an “Ocean-50” bottom grab from the board of the RV “Professor Vodyanitsky”. Each rapa whelk specimen (sample) was placed in a separate plastic bag, with the indication of the area, depth, and biotope. In total, 2,411 samples were taken and analyzed: 977 – rock rapa whelks and 1,434 – sand rapa whelks. <em>R. venosa</em> shell coverage with epibionts (fouling intensity) was determined as a percentage of the total area of the outer shell surface. Polychaeta taxocene of <em>R. venosa</em> consortium includes 31 species representing 31 genera of 15 families of 2 subclasses. Most species (18) belong to Errantia, and half of them are representatives of the families Nereididae and Syllidae. Sedentaria includes 13 species; by the largest number of species (4), the family Serpulidae is represented. Polychaeta taxocene of <em>R. venosa</em> consortium is represented by three biogeographic groups: native species of the Mediterranean-Atlantic genesis (84 %), the Black Sea endemics (10 %), and recent invaders of various geographical genesis (6 %). On sand rapa whelk, 31 Polychaeta species were found; on rock rapa whelk, only 5 species were recorded. The indicators of Polychaeta fauna development differ significantly by the depth and research area. The most diverse polychaetes are those in bays of Sevastopol (the area No. 3) at depths of 2–10 m; the maximum depth of Polychaeta finding (40 m) corresponds to the greatest depth of rapa whelk sampling. The area of shell coverage with polychaetes reaches 70 %; occurrence in several areas is up to 95 %. The maximum number of species found at a single rapa whelk specimen is 8; on average, 2–4 Polychaeta species are recorded at <em>R. venosa</em> individuals. Taxonomic diversity and abundance of polychaetes determine their significance in <em>R. venosa</em> consortium. Due to the invasive predatory mollusc <em>R. venosa</em>, polychaetes get additional opportunities for spread on the Black Sea shelf.</p> I. P. Bondarev N. A. Boltachova Copyright (c) 2021 A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS 2021-06-16 2021-06-16 6 2 18 32 10.21072/mbj.2021.06.2.02 Intra- and interpopulation variability of cysts and adults of Artemia (Branchiopoda: Anostraca) in Siberian populations (morphometry) <p>The size of <em>Artemia</em> cysts is an important indicator of their value as a food resource; to some extent, it allows to identify populations. The data on cysts of <em>Artemia</em> parthenogenetic populations (diameter, chorion thickness, and presence of spots on a shell), sampled in hyperhaline lakes of Western Siberia in different years, were analyzed, as well as the data on the morphometry of <em>Artemia</em> adults, reared from cysts at the same salinity. Significant intra- and interpopulation variability in the indicators was established. The absolute values of the cyst diameter were in the range of 210–330 µm, the mean values for the samples – 243.5–282.9 µm, the mean values for populations – 257.8–279.6 µm; the absolute values of the decapsulated cyst diameter were in the range of 196–294 µm, the mean values for the samples – 236.5–262.6 µm, the mean values for populations – 239.9–253.2 µm; the absolute values of the cyst chorion thickness were in the range of 3.3–16.9 µm, and the mean values for populations – 6.6–12.4 µm. In the main commercial fishing lakes, which account for about 70 % of the total catch of <em>Artemia</em> cysts in Russia, the cysts had similar mean population sizes: 262–268 µm. The absence of intrapopulation anchoring of the cyst diameter and chorion thickness values is concluded; so, they cannot serve as reliable indicators, identifying Siberian populations. Statistically significant correlation (<em>r</em> = −0.5) was established between salinity of a mother water body and <em>Artemia</em> embryo diameter. Cyst spotting, not exceeding 5 % in almost all the samples, reached 24 % in cysts of Kuchukskoye Lake. Analysis of morphometric indicators of <em>Artemia</em> adults, reared from cysts, showed as follows: the mean body length (9.27–11.63 mm), abdomen width (0.53–0.69 mm), and distance between eyes (1.36–1.52 mm) were closely correlated with salinity of a water body (<em>r</em> values were of −0.76; −0.62; and −0.67, respectively). Cluster analysis of a set of morphometric indicators of <em>Artemia</em> adults showed the unification of populations based on salinity.</p> L. I. Litvinenko K. V. Kutsanov L. F. Razova A. Sh. Gadiadullina A. G. Gerasimov E. V. Brazhnikov Copyright (c) 2021 A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS 2021-06-16 2021-06-16 6 2 33 51 10.21072/mbj.2021.06.2.03 Cetaceans of the Barents Sea: Fauna and population status at the beginning of the XXI century <p>The Polar branch of Russian Federal Research Institute of Fisheries and Oceanography (VNIRO) carries out annually comprehensive surveys in the Barents Sea. This allows obtaining relevant data on distribution and occurrence of marine mammals, in particular cetaceans – the key link in the World Ocean ecosystem. In recent years, marine mammals monitoring has become increasingly important due to climate change and temperature rise in seas and oceans, that can result in habitat displacement and even possible extinction of certain species. This article summarizes the results of the vessel surveys of cetaceans carried out by the Polar branch of VNIRO in the Barents Sea in 2010–2019, as well as provides retrospective data on baleen whales (Mysticeti) and toothed whales (Odontoceti). Based on vessel survey material and taking into account data from literature sources, the current composition of the Barents Sea cetacean fauna is presented; at the beginning of the XXI century, it may include up to 16 species of 7 families. The analysis of vessel survey data made it possible to determine the status of marine mammals of this water area and to identify the frequency of their occurrence. The article presents population abundance for most species of baleen and toothed whales and shows the most likely spots of cetacean occurrence. According to the data obtained, white-beaked dolphin <em>Lagenorhynchus albirostris</em> is the most abundant, frequently sighted, and a year-round species: it accounts for more than 80 % of the total number of surveyed animals and about 50 % of all sighted cetaceans. Beluga whale <em>Delphinapterus leucas</em> and harbor porpoise <em>Phocoena phocoena</em> are also classified as permanent residents of the water area, and their localization is mainly confined to the Kola Peninsula coastal zone. May to October, the Barents Sea is regularly visited by species arriving from other Atlantic Ocean areas for feeding: minke whale <em>Balaenoptera acutorostrata</em>, fin whale <em>Balaenoptera physalus</em>, and humpback whale <em>Megaptera novaeangliae</em>. Narwhal <em>Monodon monoceros</em> and northern bottlenose whale <em>Hyperoodon&nbsp;ampullatus</em> are rarely sighted in the Russian Arctic western area.</p> T. V. Mishin Copyright (c) 2021 A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS 2021-06-16 2021-06-16 6 2 52 68 10.21072/mbj.2021.06.2.04 Change in plutonium sedimentation fluxes into the bottom sediments of the Sevastopol Bay before and after the Chernobyl NPP accident <p>The Sevastopol Bay located in the northern Black Sea was exposed to radioactive contamination by anthropogenic radionuclides, <em>inter alia</em> <sup>238,239+240</sup>Pu, and to other types of anthropogenic load. One of them was the construction of breakwaters at the bay mouth in 1975–1986, which resulted in a change in the hydrological regime. The aim of this work was to assess the change in <sup>238</sup>Pu and <sup>239+240</sup>Pu sedimentation fluxes into the bottom sediments of the Sevastopol Bay mouth in the period before and after the Chernobyl NPP accident (1962–1986 and 1986–2013, respectively). Plutonium in sediments was determined by the radiochemical method, followed by measurement of the activity of radioisotopes with an alpha spectrometer. The sedimentation rate was defined by geochronological dating of sediment layers, accessing the change in <sup>238</sup>Pu/<sup>239+240</sup>Pu activity ratio in the bottom sediment core. Then, the mass accumulation rate in the bottom sediments was calculated. As established, in the period after 1986, the mean annual sedimentation rate and mass accumulation rate in the bay mouth increased by 63 and 70 %, respectively. Assessment of <sup>238,239+240</sup>Pu sedimentation fluxes during two research periods showed as follows: after 1986, <sup>238</sup>Pu and <sup>239+240</sup>Pu fluxes into the bottom sediments increased by 150 and 49 %, respectively. The increased <sup>238</sup>Pu percentage in plutonium sedimentation flux after 1986 indicates Chernobyl origin of plutonium in the bottom sediment layers above 11 cm. In the post-Chernobyl period, the cumulative effect of an increase in <sup>238,239+240</sup>Pu sedimentation flux into the bay mouth results both from an increase in the radioactive fallout intensity after the Chernobyl NPP accident and an effect of breakwaters on the regime of sedimentation processes in the water area (an increase in the mass accumulation rate).</p> A. A. Paraskiv N. N. Tereshchenko V. Yu. Proskurnin O. D. Chuzhikova-Proskurnina Copyright (c) 2021 A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS 2021-06-16 2021-06-16 6 2 69 82 10.21072/mbj.2021.06.2.05 Resources and structure of horsemussel Modiolus kurilensis settlements in Peter the Great Bay (the Sea of Japan) <p><em>Modiolus kurilensis</em> F. R. Bernard, 1983 (Mollusca, Bivalvia) can be found in Peter the Great Bay (the Sea of Japan) both on soft and hard substrates, often together with the mussel <em>Crenomytilus grayanus</em> (Dunker, 1853); it is a promising commercial species. This mollusc is a by-catch when catching <em>C. grayanus</em>. The aim of the work was to assess <em>M. kurilensis</em> resources and settlement structure in Peter the Great Bay. The research was carried out in 2007–2018 by scuba-diving methods of hydrobiological research at the depths of down to 20 m. In total, the data were analyzed for 2,409 stations; <em>M. kurilensis</em> was found at 308 stations. Sampled molluscs were measured and weighed. The material was processed statistically and cartographically; the mean biomass and distribution density of <em>M. kurilensis</em> settlements were calculated. In total, 870 horsemussels were analyzed for studying the settlement structure. The following indicators were estimated: index of settling (ratio of the abundance of juvenile molluscs with a shell length of 1–30 mm (spat, yearlings) to the abundance of adults with a shell length of &gt; 50 mm); index of maturation (ratio of the abundance of pre-reproductive molluscs with a shell length of 35–50 mm to the abundance of adults with a shell length of &gt; 50 mm); index of replenishment of the commercial stock (ratio of the abundance of molluscs with a shell length of 95–100 mm (recruits) to the abundance of molluscs of commercial length of &gt; 100 mm). The state of <em>M. kurilensis</em> population in Peter the Great Bay is stable: the ratio of molluscs of non-commercial length varies 52 to 86 % in most settlements, which indicates active natural reproduction and regular replenishment of the benthic part over many years. Replenishment of settlements with settling of both spat and yearlings depends on the presence of pelagic larvae in the plankton, while replenishment of the mature molluscs depends on favorable conditions for juvenile survival. In 2007–2018, the mean values of the indices of settling and maturation in <em>M.</em> <em>kurilensis</em> settlements in Peter the Great Bay were of (0.18 ± 0.07) and (0.05 ± 0.01), respectively. <em>M. kurilensis</em> resources are estimated at 27.1 thousand tons, and the commercial stock – at 16.4 thousand tons. The annual replenishment of the commercial stock of <em>M. kurilensis</em> in Peter the Great Bay is possible in a volume of more than 3 thousand tons. The mean value of the index of replenishment of the commercial stock is of (0.21 ± 0.03).</p> L. G. Sedova D. A. Sokolenko Copyright (c) 2021 A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS 2021-06-16 2021-06-16 6 2 83 94 10.21072/mbj.2021.06.2.06 Comparative characteristics of the ultrastructure of nephron cells in some species of pelagic, epibenthic, and demersal fish (the Karantinnaya Bay, the Black Sea) <p>The ultrastructure of the main sections of the mesonephros nephron in Black Sea teleost fish is studied. The species investigated are as follows: pelagic <em>Trachurus mediterraneus</em> (Steindachner, 1868) and <em>Chelon auratus</em> (Risso, 1810); epibenthic <em>Diplodus annularis</em> (Linnaeus, 1758) and <em>Spicara flexuosa</em> Rafinesque, 1810; and demersal <em>Scorpaena porcus</em> Linnaeus, 1758, <em>Gobius niger</em> Linnaeus, 1758, and <em>Mullus barbatus ponticus</em> Essipov, 1927. It is shown that in Black Sea fish, which inhabit different depths and are under different conditions of environmental osmotic pressure, nephrons at the tissue level of organization have a single structure and form glomerular kidneys. Fish adaptability to the habitat at certain depths is primarily manifested in an increase in the number and size of mitochondria of all types of nephron epithelial cells. A decrease in the renal corpuscles area, the length of podocytes, and height of tubular epithelial cells, as well as the brush border length of type I proximal tubules is also recorded. Nephron cytological peculiarities of pelagic, epibenthic, and demersal fish characterize a high adaptive capacity of the mesonephros cellular structures.</p> E. A. Flerova G. M. Chuyko Copyright (c) 2021 A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS 2021-06-16 2021-06-16 6 2 95 109 10.21072/mbj.2021.06.2.07 To the jubilee of D. Sc. German Zuyev <p>On 27 June, 2021, German Zuyev, D. Sc., Professor, and one of the oldest researchers at the A. O. Kovalevsky Institute of Biology of the Southern Seas, is celebrating his 85<sup>th</sup> birthday. G. Zuyev is the author of more than 240 scientific publications, <em>inter alia</em> two individual monographs.</p> Colleagues from IBSS ichthyology department Copyright (c) 2021 A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS 2021-06-16 2021-06-16 6 2 110 112 Tribute to Professor Victor Zaika <p>In 2021, Victor Zaika, Corresponding Member of the National Academy of Sciences of Ukraine and Winner of the State Prize of Ukraine in Science and Technology, turned 85. He’s been gone for seven years. V. Zaika lived a long and very intensive life in science. His mind had no peace in studying the various manifestations of life that he loved. Victor Zaika enriched science with his ideas and works, striving for possible perfection in everything he did. Generously gifted by nature, creatively charming, and inspiring colleagues by his own example, he was constantly in a state of scientific inquiry. And those, who were fortunate enough to work with him, are infinitely grateful to fate for that.</p> Copyright (c) 2021 A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS 2021-06-16 2021-06-16 6 2 113 116 In memoriam: Alexandra Shmeleva (17.05.1926 ‒ 04.01.2021) <p>On 4 January, 2021, Alexandra Shmeleva, one of the world’s most famous copepodologists, PhD, the oldest researcher at the A. O. Kovalevsky Institute of Biology of the Southern Seas, passed away at the age of 95.</p> Zh. P. Selifonova Copyright (c) 2021 A. O. Kovalevsky Institute of Biology of the Southern Seas of RAS 2021-06-16 2021-06-16 6 2 117 118