Recent features in oceanography, forage base, and biological diversity, as well as fisheries prospective in the Bering Sea Convention area are considered. Since 1950, a sharp increase in water temperature has been observed, and thermal regime shifts occurred in 1977 and 2014. Composition and structure of zooplankton communities are virtually the same as in the western Bering Sea basin. Zooplankton community is comprised by a small number of widely distributed species, which belong to macrozooplankton and constitute a valuable food source for upper trophic levels. Nekton biomass is small, an order of magnitude lower than on the shelf. Neighboring continental slope and underwater ridges, as well as seasonal migrations of lower boreal and lower boreal-subtropical species support high species richness of nekton community. Pelagic and benthopelagic species of fish and squid, which occur on the shelf and slope, usually do not migrate into the Convention area in large quantities, except for walleye pollock, which was actively harvested in this area in 1983–1992. However, in the up-coming years, it is impossible to resume pollock fishery in the Convention area, based on the modern state of pollock resources.

Based on the data of seine surveys (June 2018 and 2019, 57 and 38 catches), species composition and structure of fish communities of the middle and low Amur River were studied. The species richness of fish in the low Amur River is higher compared to the middle Amur River, 37 and 22 species, respectively. Upstream of the Amur River, fish biomass falls. At the beginning of summer, its average value in the low Amur was equal 1,354±0,209 g/m2, in the middle Amur – 0,324±0,058 g/m2. In the middle Amur River, the fish biomass was dominated by Hemiculter spp. (29,1%), Opsariichthys bidens (28,0%), Leuciscus waleckii (22,1%), Squalidus spp. (7,5%) and Tachysurus sinensis (3,9%). In the catches on the low Amur River, the fish biomass was dominated by Hemiculter spp. (26,2%), Leuciscus waleckii (21,0%), Hypomesus olidus (18,1%), Rhynchocypris lagowskii (7,6%), Carassius gibelio (7,2%), Rhodeus sericeus (5,0%) and Xenocypris macrolepis (4,6%). Local maxima of fish abundance were determined by the ecological preferences of most common fish species (in particular, their reopreferendum).

The paper presents information on the weight and linear growth and morphophysiological parameters of the Baikal seal in 2018–2021. The coefficients of allometric growth of body parts and internal organs of the Baikal seal have been calculated. It is shown that animals of all age and sex groups in the autumn period of 2018–2021 were smaller in length and body weight than in the same period 1961–1980.

In a comparative aspect, the size and age composition, fatness, maturation and nutrition of the saffron cod in the lakes Nerpichye, Bolshoy Kalygir and Bolshoy Vilyu are considered. The features of habitat conditions and annual life cycle are investigated. At the present stage, saffron cod in the studied waters is an object of amateur ice fishing.

In the pelagial of the Russian waters of the Sea of Japan, juveniles and adults of the Arabesque greenling Pleurogrammus azonus are found from March to November. The average size of fingerlings of Arabesque greenling increase from South to North. Larger sizes of fingerlings in the north are determined by earlier spawning, compared to the south. Density aggregations of Arabesque greenling in the pelagic zone is much smaller than in the bottom layers of water. High migration activity is characteristic of a smaller hart of individuals.

We describe an approach to analyzing time series for two variables connected through the state model with abundance and catch data sets and cohort and catch equations as an example. First, we create a deterministic model with parameters that maximizes the closeness of given data and data generated by a model. Then, we obtain cohort stochastic models using the difference between initial and modeled data. They are represented as hidden Bayesian models with abundances as states and catches as observations. Using these models, one can evaluate posterior densities and calculate averages, deviations, etc. As a general matter, the recursive equations met by posterior densities have no analytic solutions. We describe several particle methods that may be used for density approximations and following calculations of their statistical quantities. All generated sample densities are smoothed with non-parametric kernel density estimation. The Fishmetica package was extended with functions for generating samples and weights for filtering, predicting and smoothing densities. Numerical simulations were conducted for a test data set. Several extensions of the approach are proposed including an additional option for comparing the basic models with the use of a likelihood function.

The studies carried out in this work made it possible to characterize the dynamics of the raw material base of aquatic biological resources of the Russian waters of the Chukchi Sea in 1997–2020 and evaluate its value at the present stage. The raw material base of marine fish and invertebrates varied from 5,4 to 450,1 thousand tons (with an average value of 196,7 thousand tons). It was based on marine fish – an average of 189,0 thousand tons (96,1% of all resources), stocks of invertebrates – 7,7 thousand tons (3,9%). Estimates of the commercial WBR biomass in the Chukchi Sea are approximately 24 times lower than the estimates of the resource base of the western part of the Bering Sea: 4,1 and 5,1% of the biomass of marine fish and invertebrates, respectively. Stocks of hydrobionts showed a gradual downward trend from 1997 to 2007, a low level in 2008–2017 and a sharp rise in 2018–2020. Significant growth in resources in the late 2010s led to mass walleye pollock migration to the Chukchi shelf from the Bering Sea, which led to an increase in the raw material base of WBR by 431 thousand tons and a concomitant increase in its cost by 23,7 billion rubles. The cost of the raw material base of the Russian waters of the Chukchi Sea in 2019–2020 amounted to 34–51 billion rubles, in absolute terms yielding to the Bering and Okhotsk seas by 14,0 and 31,3 times. The most valuable species of bioresources in terms of value were cod fish (walleye pollock Gadus chalcogrammus) and crabs (snow crab Chionoecetes opilio), the total contribution of which exceeds 90% of the total value of the estimated commercial stocks of the sea. With a high probability, it can be assumed that it is these types of WBR that will form the economic basis of the Russian fishery in the Chukchi Sea in the future.

On the basis of fishing statistics and research by observers on fishing vessels, an analysis was made of the distribution of capelin catches, the main indicators of fishery (effort, average daily capacity) were considered; length composition of the species was analyzed. It has been established that in 2018 and 2022 the most conductive conditions for capelin fishery, both in terms of capacity and the length composition of the species, were formed in the second half of February and in March in the economic zone of Norway. The reasons for the incomplete realization of the russian quota of capelin in 2018 were the non-optimal timing of fishing by the main group of vessels, in 2022 – an insufficient number of fishing efforts. In March 2018 and 2022, difficult weather prevailed at the fishery, which could prevent the effective realization of the russian quota of capelin.

Information on the state of commercial stocks of the fish population of the Ivankovo reservoir from 1980 to the present is presented. According to our data, the total commercial fish stocks in the Ivankovo reservoir in comparison with the 1980s and 1990s decreased by almost 1,000 tons. Over the past 5 years, they have been in the range of 2245–2808 tons. The closure of industrial fishing in 2007 led not to an increase, but to a decrease in fish stocks, due to a decrease in the rate of their linear and weight growth, deterioration of exterior and commercial qualities. The material damage caused by the closure of industrial fishing at the Ivankovsky reservoir since 2007 has been determined. To determine the material damage caused by the closure of industrial fishing at the Ivankovsky reservoir, retail prices for 21 types of fish were determined. The resulting value for each type of fish was correlated with the volume of fish that was not caught due to the absence of fishing in the period from July 2007 to 2022. Data on catch volumes in the Ivankovo reservoir are taken from the Orders on approval of the total allowable catches and recommended catch of aquatic biological resources in 2007–2022. Over the past 15 years, the possibility of catching almost 7.4 thousand tons of fish has been lost, which in monetary terms is 1,103 million rubles.

The article outlines the issues of introducing a factory method of growing fish planting material in individual fish farms of the Central Federal District on the basis of creating a network of specialized farms (reproducers), which will solve the problem of rapid introduction of existing and newly created fish species into production. At the same time, it is proposed to integrate production on the basis of cooperation and specialization, including vertical production links of various sectors of commercial fish farming (breeding, reproducers, etc.), which will create prerequisites for the efficiency of pond farms. Correlation analysis was used as a research tool for breeding and commodity farms of the Moscow region, on the basis of which the main factors affecting the cultivation of commercial fish were identified.

The effect of rapeseed oil methyl ether (RME) on cladocerans (water flea Daphnia magna Straus) and fish embryos and prolarvae (round goby Neogobius melanostomus (Pallas)) is investigated. It has been determined that, with the increase of RME content in the water, the decrease in the survival rate, fecundity, abundance, and biomass of Daphnia population is observed, as well as the decrease in the survival rate of round goby embryos and fry and in the linear and weight growth rate of the fry. RME did not produce any teratogenic effect on the round goby embryos and fry in the investigated range of concentrations 1,25–100,0 mg/L. Based on the experimental data, no observed effect and lowest observed effect concentrations of RME have been identified.

The fishery industry supports the food security of the State, provides a livelihood for a significant proportion of the population of our country and ensures their employment, and this will continue in the foreseeable future, provided that the industry is effectively managed. One of the most important areas of state management of the fishing industry in Russia since 2016 is the restoration and strengthening of the technical potential of the industry. The article examines the current state of the production and technical potential of the fishing industry, identifies problems and suggests mechanisms for strengthening the technical potential of the industry. At a time when the production of fish products is growing, it is critically important to increase the technical potential, while it is necessary to take into account the ongoing structural and systemic changes in the fishing industry.

The use of Russian and foreign classifiers of products (goods, works, services) is a key moment in ordering objects in the system of state statistics and regulation of foreign economic activity, in the field of technical regulation and taxation. The article considers the need to update the all-Russian classifier of products by type of economic activity in terms of fish products, which contributes to filling other forms of state reporting with an expanded list of types of aquatic biological resources, which makes it possible to track the movement of fish products by type in the domestic market when moving from fishing areas to the central regions and control over the full chain of use of raw materials from catch to consumption.