Abstract An original method is proposed for rapidly differentiating between regional pink salmon runs with different timings of spawning and states of gonads (gonadosomatic indices, GSI). The results of differentiation obtained by the original and traditional methods are compared. The concept of spatial niches for various temporal groups of Sea of Okhotsk pink salmon in Pacific waters off the Kuril

Abstract This study provides biological, fishery, and production characteristic of spawning females of a triple hybrid between the Russian sturgeon, Siberian sturgeon, and Amur sturgeon (RS × SS) × AS and other commercial hybrid sturgeon forms grown in the cages of a warm-water fish farm in Primorsky Krai, Russia. The survival rate of larvae and juveniles of the triple hybrid in conditions of warm-water

Abstract The current status of the red king crab population off western Kamchatka is considered based on data from bottom trawl surveys and fishery statistics since 2013. Some biological parameters of this crab species are provided; its commercial stock is estimated; some features of red king crab fishery and determination of total allowable catch for the past 7 years are analyzed. The red king crab

Abstract The density and biomass of aggregations of the clam Mya uzenensis have been studied in four areas of the littoral zone in Taui Bay. Aggregations of this bivalve species were mosaically distributed in the form of beds from 0.5 to 5.0 m2 in size. On suitable sediments, Mya aggregations occupied 25–40% of the littoral zone area. The structure of aggregations in the littoral zone of Ola Liman

Abstract The distribution of fish and prawn in the bed of the lower Amur River (within 40–960 km from the mouth) is described based on the results of a beam-trawl survey (57 trawl taw at depths of 1.5–23.0 m) conducted in September and October 2003. A total of 2584 ind. of 22 fish species and 1077 ind. of one invertebrate species (the prawn Palaemon modestus) were caught. The most frequently occurring

Abstract The dynamics of the Atka mackerel stock in the Olyutorsky–Navarin area in 1994–2019 is inferred from bottom-trawl surveys, fishery statistics, open-access NOAA data, and the results of simulation by the method of virtual population analysis. After the period of low stock in the mid-1990s, the abundance of the Atka mackerel group in the area increased sharply to a maximum in 2006–2008, when

Abstract The effect of water temperature on the timing of spawning and spat settlement of the Yesso scallop (Mizuhopecten (=Patinopecten) yessoensis Jay, 1857) in Minonosok Cove (Posyet Bay, Peter the Great Bay) has been studied based on the most complete dataset of observations for 1970–2011. The date of onset of spawning varied from May 1 to June 9 (within 40 days) and the onset of spat settlement

Abstract An aerial survey of Pacific salmon spawning grounds in the main watercourses that empty into the Bering Sea was conducted for the first time since 1992. The total flight time was 35 h; the approximate total length of transects was 3800 km. The number and distribution of Pacific salmon spawners in the Anadyr, Velikaya, Tumanskaya rivers and in the Meynypilgyno lake–river system have been assessed

Abstract A spawning ground of the Mud Skate Bathyraja taranetzi and the Okhotsk Skate B. violacea was recorded for the first time from Pacific waters off the northern Kuril Islands. It was located at 50°25′7″ N, 157°22′7″ E, and a depth of 350–351 m; the water temperature was 3.8°C. At the spawning ground, egg cases and recently hatched juveniles were found in large numbers.

Abstract The spectrum of proteinases and the dynamics of proteinase activity in the ambulacrum structures were studied by quantitative gel zymography in the holothurians Eupentacta fraudatrix and Cucumaria japonica under normal conditions and after transverse cutting of the ambulacrum. Proteinases with gelatinolytic activity were detected only in E. fraudatrix; the species had two pools of proteinases

Abstract The present study is aimed to investigate the effects of iron nanoparticles (Fe-NPs) on growth performance, liver histopathology and some blood parameters of the stellate sturgeon (Acipenser stellatus) juvenile. A total of 144 fish (182.09 ± 9.05 g) were fed diets containing graded levels of Fe-NPs (0, 25, 50, and 100 mg kg–1 diet) for 8 weeks. No significant differences were observed in weight

Abstrac— Intensive algal sampling was conducted from 2017 to 2019 in coastal waters of Wuzhizhou Island (South China Sea, China). In total, 183 species of marine macrophytes, 9 species of Cyanobacteria and 2 species of seagrasses were found. The collection of benthic macroalgae was comprised of 63% of Rhodophyta, 12% of Phaeophyceae, and 25% of Chlorophyta. Among macrophytes, the largest number of

Abstract The growth parameters were determined separately for the two sexes of Penaeus kerathurus, as well as for the two (northeastern and southern) substocks of the species in Tunisia. Seasonal sampling from catches of this species in the coastal and the offshore waters was carried out during the period between 2010 and 2012 for the northeastern substock and between 2010 and 2014 for the southern

Abstract This study reports recent data on the distribution and breeding abundance of seven species of colonial birds on the coast of Peter the Great Bay, Sea of Japan. Over the past 30 years, three species of cormorants (great, Japanese, and pelagic cormorants), as well as the black-faced spoonbill, have significantly increased their numbers. The number of breeding pairs of gray heron and Chinese

Abstract This article provides results of a helminthological study of two seabird species, the Black-Legged Kittiwake (Rissa tridactyla Linnaeus, 1758) and the Brünnich’s Guillemot (Uria lomvia Linnaeus, 1758), from Russkaya Gavan Bay, Severny Island, Novaya Zemlya Archipelago. A total of five species of helminth parasites were identified in kittiwakes and six species in guillemots. The cestode Tetrabothrius

Abstract The summarized composition of the fish fauna of the Karkinitsky Gulf of the Black Sea was established for the first time on the basis of literature and original data for the entire period of research; 108 fish species were recorded in total. Twenty-three new fish species, among them representatives of the Mediterranean faunistic complex, form the basis of the faunistic diversity of the western

Abstract Several fundamentally different pathways may exist to restore a lost structure in closely related species or within the same species of multicellular animals; this phenomenon is described using the example of the echinoderm digestive system. We propose to call this phenomenon “variability of regeneration mechanisms.” In echinoderms, it is manifested as differences in the spatial organization

Abstract In this study, otolith shape analysis has been used to perform identification of two smelt species specimens (genus Hypomesus), H. japonicus and H. nipponensis, as well as differentiation of local gatherings in the first species, in the north-western Sea of Japan (SJ). Based on the otolith shape and using several multidimension statistical approaches obvious differences were defined for both

Abstract A seasonal spring-run (vernal) ecotype of the Steelhead Trout Parasalmo (Oncorhynchus) mykiss (Walbaum, 1792) has been found in western Kamchatka for the first time. Fish of this ecotype perform anadromous migration in May; however, the timing and grounds of spawning of the spring- and fall-run (hiemal) ecotypes in Kamchatka completely overlap. An analysis of microsatellite loci of both ecotypes

Abstract The species composition of macrophytic algae in Troitsa Bay (Peter the Great Bay, Sea of Japan) was studied from June to September in 2004–2018. A total of 111 macrophytes were found, of which 28 were epiphytes. The phylum Rhodophyta was the most diverse group represented by 58 species (or 54% of the total number of identified species); the phylum Ochrophyta (class Phaeophyceae) was represented

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Abstract The profiles of bacterial O-glycoside hydrolases and alginate lyases associated with the red alga Ahnfeltia tobuchiensis are described for the first time. A role of these enzymes in the trophic relationships of the host organism and bacteria is discussed.

Abstract The present study was intended to investigate the presence of major chemical components in seaweed extracts by using of Fourier-transform infrared spectroscopy (FTIR) and to explore the antibacterial and in vitro anti-inflammatory (membrane stability) properties of ethanolic extracts of nine different seaweeds collected from the Ramewaram coastal region. Total flavonoid content (TFC) and total

Abstract The advantages and disadvantages of statistical methods for estimating the age of animals that lack recording structures are discussed in the article. The discussion is supported by examples from studies on the growth of the bivalve mollusk Mizuhopecten yessoensis (Jay, 1857). The age of individuals of this species can easily be determined by morphological marks on the shell surface. This

Abstract This review examines the main characteristics of the reproductive strategy in hermit crabs: the sex ratio, the age (size) of onset of maturity, fecundity, and duration of the incubation period, as well as their dependence on the availability and quality of accessible gastropod shells. The latitudinal variation in reproductive characteristics and the peculiarities of reproduction of coastal

Abstract Strains of Vibrio spp. isolated from samples of water and aquatic organisms of the temperate (173 strains) and tropical (124 strains) climatic zones were phenotypically characterized. Identification, carried out on the basis of an extended analysis of phenotypic properties, made it possible to identify previously undiagnosed species. V. alginolyticus, V. parahaemolyticus, and V. splendidus

Abstract From 1983 to 2018, in the Alas Purwo National Park (APNP) beach, the olive ridley sea turtle (Lepidochelys olivacea) nested population showed a significantly increasing number compared to the other three species using the same beach. One of the reasons is believed to be the success of conservation efforts (nest relocation and protected egg incubation) to produce a balanced hatchling sex ratio

Abstract The present review briefly summarizes the results of the studies on coral reefs of the Indo-Pacific conducted by the authors and their colleagues who participated in joint publications and research since the late 1970s until recently. Experimental field and laboratory-based works were carried out during expeditions aboard the R/V Kallisto and R/V Akademik Aleksandr Nesmeyanov, as well as at

Abstract This study examines the effect of copper (100 and 200 μg/L) on the cell number dynamics, cell size and ultrastructure, chlorophyll a fluorescence, mitochondrial membrane potential, and neutral lipid content in the microalga Picochlorum maculatum (Chlorophyta) during a 7-day exposure. The addition of copper led to the inhibition of population growth; the cell size and ultrastructure remained

Abstract This study provides the first description of the feeding aggregation recently formed by humpback whales in the Senyavin Strait, off eastern Chukotka. A total of 143 individuals were identified during the two summer and fall seasons of 2017 and 2018. More than half of the whales recorded in the first year were encountered again in the following year. The spatial distribution of feeding whales

Abstract Two hundred and forty eight strains of heterotrophic microorganisms were isolated from bottom sediments of the Chukchi Sea. A 16S rRNA gene sequence analysis was used to classify representatives of 33 genera that belong to the phyla Proteobacteria, Bacteroidetes, Firmicutes, and Actinobacteria. Phylogenetic analysis showed that at least eight bacterial groups displayed 97−98% similarity of

Abstract The effects of some hydrolytic enzymes from marine organisms on the formation and destruction of bacterial biofilms have been studied. As the results show, the presence of α-D-galactosidase from the marine bacterium Pseudoalteromonas sp. KMM 701 stimulates the growth of biofilms formed by various species of marine bacteria, whereas the formation of biofilms by Bacillus subtilis and Yersinia

Abstract This review analyzes the current state of knowledge of the microphytobenthos in the Russian waters of the Sea of Japan and adjacent sea areas. A retrospective analysis of the literature shows that microphytobenthos, with its primary production that often exceeds the production of phytoplankton, plays an important role in coastal marine ecosystems. Benthic diatoms in the coastal waters of Peter

Abstract A mycological examination of the saffron cod Eleginus gracilis (Tilesius, 1810) and the Asiatic smelt Osmerus mordax dentex Steindachner & Kner, 1870, caught in the Amursky Bay (Peter the Great Bay of the Sea of Japan) revealed several species of filamentous fungi. In total, 105 isolates of filamentous fungi were obtained from the skin integument and internal organs (31 isolates from the saffron

Abstract The dynamics of glycogen recovery in the muscles and liver of the European flounder Plathichthys flesus (Linnaeus, 1758) and the European sprat Sprattus sprattus (Linnaeus, 1758) after exposure to trawl fishing has been studied. As the results show, the stress-inducing effect of fishing does not alter the glycogen content of the organs in the flounder, which leads a sedentary life, whereas

Abstract This review provides information on the structure of growth hormone genes (GHGs) in fish and the divergence of coding, intron, and adjacent flanking regions; original data obtained in our laboratory are also considered. In most fish species, GHGs are represented by a single copy, while some taxonomic groups have two paralogous genes. The coding sequences of GHGs are conserved. Gene length

Abstract— Acanthogobius ommaturus, which belongs to the family Gobiidae, is a euryhaline, demersal fish widely distributed in coastal areas, harbors, and estuaries of China, the Korean Peninsula, and Japan. A genetic analysis based on identification of the structure of mitochondrial DNA control region was carried out in the present study. As a result, the conservative structure, including termination

Abstract The morphology of the mandibles in the lobster shrimps Boasaxius princeps and Leonardsaxius amurensis is described at different stages of ontogenesis. The incisor process of the mandibles in axiid zoeae is flattened antero-posteriorly, with three stout terminal teeth; the molar process is broad, the grinding surface is formed by transverse cuticular ridges and bears a fringe of brush-like

Abstract The present study considers effects of a lipid complex isolated from the aqueous–ethanol (70%) extract from the marine red alga Ahnfeltia tobuchiensis and effects of the Essentiale commercial preparation on the biochemical parameters of blood plasma and erythrocyte membranes of mice exposed to experimental stress (suspension by the scruff of the neck). The pharmacological effect of the lipid

Abstract Long-term study of the species composition and numbers of phytoplankton in the coastal waters of Peter the Great Bay, the Sea of Japan, revealed the seasonal and year-to-year dynamics in the abundance of the diatom Thalassiosira nordenskioeldii Cleve, 1873. The species dominated the phytoplankton in the winter and early spring, growing under the sea ice at a surface water temperature of –1

AbstractThis paper reports the first occurrences of anadromous fish of the cyprinid genus Tribolodon infected with the common parasitic tapeworm Ligula intestinalis. In the autumn of 2017 and in the summer of 2018, the plerocercoids of Ligula intestinalis were found in the body cavities of two Far Eastern redfin Tribolodon hakonensis (Gunter, 1880), which were caught in the Razdolnaya River in Primorsky

AbstractThis paper describes the pelagic larvae of the bittersweet clam Glycymeris yessoensis G. B. Sowerby III, 1889 (Bivalvia: Glycymeridae) from the Vostok Bay (Peter the Great Bay, Sea of Japan). Distinctive features of the morphology of the larval shell, including structure of the hinge system, as well as size parameters of the larval shell and their ratio, are presented. The period of occurrence

AbstractThe amount of structural and storage lipids and the composition of fatty acids (FA) in the symbiotic hydroid coral Millepora dichotoma were determined monthly throughout the year. In the first half of the year, the hydrocoral actively accumulated lipids, as indicated by a twofold increase in the content of reserve lipid classes of (waxes, triglycerides, and monoalkyl diacyl glycerides) concurrent

AbstractThis review paper considers the features of the biology of cyanobacteria, their role as photosynthetics, nitrogen fixers, and producers of biologically active substances, as well as the distribution of these microorganisms in various marine ecosystems. The symbioses of marine cyanobacteria with a wide range of eukaryotic organisms are discussed.

AbstractThe distribution and size composition of the gastropod Boreotrophon candelabrum in Vostok Bay of the Sea of Japan were investigated in 2014–2019. Mollusks occurred on different bottom types and biogenic substrates, except clean washed sands of open coves and wave-exposed rocky–boulder shores. The highest abundance of B. candelabrum was observed at the head of the bay, where the density and

AbstractThe effects of Zn on two mysid, two copepod, and one decapod crustacean species from Peter the Great Bay are studied. Experiments have shown the lowest median lethal concentrations (LC50) in the case of a 48-h exposure for juvenile mysids (221 μg Zn2+/L) and the highest concentrations for juvenile grass shrimp (11 309 μg Zn2+/L). The relationship of toxicoresistance with species-specific features

AbstractAn inventory of macrophytic algae on the Con Dao Islands (Vietnam) in the South China Sea (8°38′ N, 106°41′ E) was carried out for the first time by Vietnamese and Russian phycologists from 1986 to 2008. Algae were collected in different years of this period. The first collections of marine algae from the Con Dao Islands were obtained in 1986 in the framework of the Soviet–Vietnamese expedition

AbstractThis article provides an overview of the species composition of the phylum Nemertea in the Far Eastern seas of Russia. The list of nemerteans includes at least 200 species from the classes Palaeonemertea, Pilidiophora, and Hoplonemertea. Many of the species proved to be new to science; most of them remain undescribed. Currently, the use of gene markers is often the only approach to discriminating

AbstractA comparative analysis of the current content of petroleum hydrocarbons in various components of the ecosystem was performed to assess the ecological state of the southeastern part of the Onega Bay (White Sea) that suffered from a spill of fuel oil in 2003. The analysis showed relatively low levels of petroleum hydrocarbon concentrations: from 0.34 to 4.55 mg/kg, with a median of 1.41 mg/kg

AbstractResults of our study show that juveniles of the mangrove red snapper are found all year round from the Cua Dai river mouth to Cam Kim upstream of the Thu Bon estuary, with no clear patterns of distribution between months. Variability in recruitment of juvenile fish of ≤50 mm TL was observed from June until February, and the youngest fish (≥18 mm TL) were found in mid-June. Adult mangrove red

AbstractUntil recently, it has been believed that only one cetacean species of the genus Berardius, the Baird’s beaked whale (Berardius bairdii Stejneger, 1883), inhabits the northern Pacific Ocean. However, a genetic analysis of tissue samples and morphometric data provide convincing evidence for the existence of a previously undescribed Berardius species sympatric to Baird’s beaked whale, which is

AbstractIn the course of floristic studies, we succeeded in finding Asterocolax denticulatus (Delesseriaceae: Ceramiales: Rhodophyta) in the Pacific waters near the coast of Kamchatka for the first time. This alga is an adelphoparasite that colonizes other algae of the family Delesseriaceae. The studied species is briefly characterized and illustrated and its distribution range is determined.

AbstractParasites in 61 individuals of eight species of coral reef fish (Caracanthus maculatus, Scorpaenodes sp., Sebastapistes cyanostigma, Gobiodon unicolor, Paragobiodon modestus, P. echinocephalus, Pseudocheilinus hexataenia, and Halichoeres sp.) were studied in April–May 2012–2014 and November 2017. All studied fish were symbionts of corals of the genera Acropora and Pocillopora. The parasites

AbstractThe ecological, genetic, and temporal intraspecific differentiation between populations of anadromous fishes of the genus Oncorhynchus is analyzed. It has been shown that the stability of the structure of exploited stocks and the maintenance of their abundance at an optimally high level can be provided by taking the population organization of fish during fishing operations into account. A commercial

AbstractThe quantitative dynamics of coelomic fluid cells of Eupentacta fraudatrix (Djakonov et Baranova, 1958) were studied by flow cytometry within a day after evisceration. A differently directed dynamics pattern was noted among groups of poorly differentiated juvenile cells and differentiated cells during regeneration. The juvenile coelomocyte fraction increased, while the content of differentiated

AbstractThe Sea of Azov is a part of the Mediterranean basin and is the most continental sea in the world. But the phycological studies of the Sea of Azov were irregular. To assess the ecological safety of sea water, it is important not only to determine the presence of toxigenic species in the flora, but also to confirm the presence of strains capable of synthesizing toxins. The strain Nostoc linckia

AbstractLife cycle, population dynamics, growth, and annual production of Ecrobia maritima (Milaschewitsch, 1916) associated with the eelgrass Zostera noltei bed in the southern part of the Romanian Black Sea coast were investigated. Monthly quantitative random samples were taken from June to October 2015 and the collected snails of E. maritima were counted, measured, and weighted. The mudsnail E.

AbstractIn northern Primorsky Krai, males of the Siberian lumpsucker Eumicrotremus asperrimus (Tanaka, 1912) with much reduced or missing bony tubercles occur almost all along the coastline. The lack or significant reduction of bony tubercles in males is a secondary sexual characteristic of this species indicating that such males can participate in breeding. Three main stages are distinguished in the

AbstractIt was shown for the first time that the red alga Palmaria palmata (Linnaeus) F. Weber et D. Mohr, 1805 not only retained its physiological activity under the conditions of moderate pollution of the seawater with diesel fuel, but also exhibited a pronounced ability for sorption and destruction of petroleum products. The content of diesel fuel components in seawater decreased simultaneously

AbstractThe present review summarizes information available in the published literature on the distribution of disseminated neoplasia, or malignant leukemia (leukemia-like cancer), in populations of several bivalve species. This disease of marine Bivalvia has long been known; currently (with the development of molecular-genetic methods) its etiology is associated with retrotransposons that can be transmitted