The article discusses the principles of using modeling techniques in industrial fisheries when conducting bioeconomical analysis. The structure of the constituent components of this analysis is proposed. The reasons for the occurrence of erroneous decisions in the fisheries management system leading to overfishing and depletion of stocks of aquatic biological resources are listed.

The purpose of the article is to show the need to reduce wholesale domestic prices for fish products and to propose economic methods for solving this problem. The relevance is associated with an unreasonable increase in wholesale prices, which are the basis of retail prices, which led to a decrease in the consumption of Russian fish. An analysis of prices for fish products was made. Data on the unreasonably close relationship between the wholesale prices for fish in Russia and the prices for frozen products on the Oslo stock exchange are given. The expediency of developing a methodology for determining whole-sale prices in order to use them at auctions (Norwegian experience) is shown.

The trophic level of water bodies of Murmansk region was analyzed using the E-TRIX index. The key differences of currents and bottom reliefs of the investigated points are considered. The calculated data of the E-TRIX index are given, and measures to reduce the level of water trophicity are proposed.

The article examines the legal status of the Fisheries Management Sub-Committee, established in 2022 by the FAO Fisheries Committee. The history of its creation, competence is considered, development prospects and significance for fisheries management at the international level are assessed. The results of the 1st session of the Subcommittee were analyzed in detail and its significance for the development of international fisheries management was determined.

The ideas of managed sturgeon farming in the Azov and Caspian Seas, formulated and implemented in the USSR in the second half of the twentieth century, have not passed the test of time. Currently, sturgeon fishing is not conducted in these reservoirs, their stocks are significantly undermined by poaching, natural spawning is minimized, and their reproduction is carried out primarily at sturgeon hatcheries, which were preserved thanks to the formation of domesticated brood stock and the transition to lifetime production of eggs. A new scheme of managed sturgeon farming is proposed, which provides for the resumption of currently prohibited fishing and the use of caught fish only to obtain mature sexual products, after which they should be released. It is proposed to test the new scheme in the Azov basin.

The difficulties of managing populations of poorly studied species of aquatic biological resources (UBR) are typical for all fishing basins in Russia. A feature of the exploitation of these species is the lack of commercial and scientific information, which often leads to situational decision-making in their management. In the context of the problem of rational exploitation of biological resources, the history of the spiny crab fishery in the northern part of the Sea of Okhotsk is considered. Based on materials on the history of fishing and the dynamics of fishing indicators in 2000-2021, the effectiveness of measures to regulate the resource of the spiny crab is analyzed. The ambiguity of decisions to change some regulatory measures is shown. It is stated that the management of these coastal bioresources requires taking into account the socio-economic factor that significantly affects the intensity of spiny crab production.

The basis of the fishery of the Volga-Caspian fishing region is anadromous and semi-anadromous fish. The state of fishery for biological resources of the Volga River during the construction and commissioning of the Volga-Kama cascade’s hydroelectric power stations is considered. The Big Volga Program of 1933 was supposed to solve transport, irrigation and energy problems, as the most important for the industrial development of the country. The opinion of fisheries experts was not taken into account during the designing. Affairs in the fishing industry were only getting worse, as the Volga was regulated, and catches of valuable fish were falling. The construction of the first Upper Volga hydroelectric power stations did not significantly affect the fishery of the Volga-Caspian region. Further hydraulic construction on the Kama River, on the Middle and Lower Volga led to the blocking of fish routes to spawning grounds, and to a decrease in biological flow from the Volga to the Caspian Sea. The latter caused a reduction in the food supply of semi-anadromous fish and a decrease in the volume of their catch. Hopes for reservoirs as a source of additional fish resources have not been fulfilled. The main ways to solve problems are the artificial reproduction of anadromous and semi-anadromous fish, improvement of the ecological situation in the Volga River basin; during releases it is necessary to take into account the interests of fishery as much as possible. Conservation and maximum possible reclamation of the remaining spawning grounds of valuable fish species in the lower reaches of the Volga are required.

The assessment of the spawning migration of fish in the Promyshlovaya River was carried out on the basis of an integrated approach, including the joint use of sonar complexes and control catches with set of fixed nets and smooth nets in the spring period during the study period. The ichthyocenosis of the Promyslovaya River is represented by 20 species, the basis of which is bream, roach, silver bream, ruff and bleak. In 2021, roach and silver bream account for size groups from 8 to 20 cm. Among fish with a length of 23-28 cm prevail roach, bream, vimba and perch. Bream prevails in size groups of more than 28 cm. Mass spawning migration is observed when the water is heated above 12 °C In 2022, there was a decrease in the size range and the dominant size groups. In 2021, the main migration activity occurred at twilight and night, and in 2022 migration was more smooth. In 2022, there was an almost twofold decrease in the total number of passing fish compared to 2021 due to a significant drop in the number of migrating bream, due to changes in spawning conditions in the estuarine and estuarine parts of the river and bay.

Based on ichthyological materials collected in 2022-2023 in the northern part of the Agrakhan Bay of the Caspian Sea, biological indicators of silver carp, rudd, carp, roach, bream are considered. It is shown that in the considered part of the Caspian Sea, at present, despite a slight decrease in biological indicators, the condition of the groups of dominant fish species is favorable.

The paper analyzes the relationship between changes in the composition of the intestinal microbiome and amino acid composition of carp liver against the background of the use of various biologically active additives in feeding: ultradisperse particles (UDP) SiO₂ and a complex of essential amino acids (arginine, lysine, methionine). It was found that inclusion of the studied additives in the fish diet influences the ratio of Proteobacteria, Fusobacteria and Bacteroidetes abundance in the intestines of fish. The analysis of amino acid composition of the liver indicates a pronounced stimulating effect of the tested feed additives on the synthesis and accumulation of amino acids.

The article discusses the experience of growing a seaside scallop in a bottom aviary at a fish hatchery in the Kozmina Bay of Nakhodka Bay, and provides recommendations for installing and maintaining a bottom aviary.
The aviary was designed and installed in 2014. It has been tested in Kozmina Bay, and has made it possible to effectively grow scallops by bottom method in a small area. The main task of this project is to keep the planted scallop in a specific bottom area. Nylon fabric was used as a material for the wall of the enclosure. To ensure buoyancy, PVC surfacing was used in this design. The task of keeping the aviary in a given place was, for the most part, solved using gravity anchors of the GBTS. Installation and repair of the enclosure is described in paragraphs 5 and 6 of this article. In the eight years after the installation of the aviary, more than 800 thousand individuals of the Primorsky scallop were planted on the bottom area and for several years the gradual withdrawal of marketable products has been carried out. The aviary in Kozmina Bay withstood the passage of destructive typhoons that struck Primorye in recent years (including typhoon Maysak 2020). As a result of the work carried out at the fish breeding site, a kind of cluster was formed: scallop spat is also planted on the elements of GBTS, cages, the outer shell of collectors, which, when detached, automatically turns out to be in the aviary. This cluster can be supplemented with small artificial shelters (reefs) for trepang and facilities suitable for the installation area in order to obtain a sustainable multicultural economy.

Netting knotless represent fishing implements and aquaculture cages. These are mesh fabrics made of high-strength yarns without the use of knots. Polyamide and polyethylene fibers serve as the material. Nettings knotless fabrics are produced in special knitting factories that work in accordance with the technology of fixing cells. At the last stage of production, the products are subjected to heat treatment, which provides additional strength to the nettings. Such nets are superior to their nodular analogues. They are more reliable, the weight due to the lack of nodal connections is less, the risk of injury to fish is minimal, also the flow rate of such connections is better, and algae and other microorganisms do not grow to them. Netting knotless are widely used in the manufacture of cages, selective inserts of trawls, seines and traps. The article considers the application of a numerical method to determine the hydrodynamic characteristics of knotless netting using software developed by the authors. The schematization of the netting knotless was performed to create a mathematical model based on Navier-Stokes partial differential equations. The initial and boundary conditions for a given computational domain were established. The calculation was carried out on a regular computational grid using an implicit finite-difference scheme using methods of coordinate splitting, linearization of nonlinear equations with subsequent correction of nonlinear coefficients, and solution of the obtained tridiagonal systems by the run-through method. The results of numerical experiments are presented in the form of visualization of pressure on the surface of various mesh structures at different angles of attack.

An analysis of published information in the field of cryopreservation of acipenseriformes sperm was carried out. The presented review briefly traces the historical experience in the development of cryopreservation methods and examines in detail the current state of research over the past two decades. Technological approaches are systematized, the most promising development trends and existing problems are identified.

The aim of the work is a method for the production of canned food of the «Sprats in oil» type from fish of the Far Eastern basin, which ensures the production of high-quality smoked product from underused raw materials with complete absence of damage to the skin of fish. The paper substantiates the temperature and duration of the drying stage of the semi-finished product based on the study of the effect of temperature and duration of heat treatment of fish on the relative humidity of its skin, the effect of hot smoked fish on the collagen content in the skin of the semi-finished product depending on the moisture content of the skin and the effect of the collagen content in the skin of the smoked semi-finished product on the presence of damage, and the approbation of research results.
Theoretical, physico-chemical, spectrometric and mathematical research methods were used in the work.