The article deals with the issue of providing the world population with food. Data on the consumption and impact of food products from aquatic biological resources on food security in general and on the level of consumption of animal protein are presented. It is shown that in order to achieve sustainable development of the fish processing industry, it is necessary to constantly increase production volumes and expand the raw material base. The possibilities of increasing the volume of aquaculture production in various regions of the world and the problems associated with this are considered. It is indicated that a further increase in aquaculture production is possible due to pasture aquaculture and intensification of production due to feeding. For the successful implementation of the first option, it is necessary to involve new water areas and optimize the species composition, and for the second it is important to ensure an acceptable environmental load and the fullest possible use of feed. The method of intensification due to feeding is more in demand, however, the production and use of feed with a high protein content have a significant impact on the environment. It is noted that the largest amount of such feed is used in the production of salmon species. As a measure to smooth out the negative effects of salmon production, modern approaches to increasing the productivity of marine aquaculture are considered. One of the measures indicated is the possibility of growing coho (Oncorhynchus kisutch Walbaum) as part of the implementation of the concept of integrated multi-trophic aquaculture, where the natural food chain is simulated. The target species in the process of vital activity creates conditions for the production of food of another species, with this approach, the energy introduced into the artificial system is most fully used, and the principle of sustainable biomass production is implemented.

The native range of the freshwater bream Abramis brama includes the basins of the North, Baltic, White, Azov, Black, Caspian and Aral seas. This species is not a popular object of aquaculture, but it is cultivated in some countries of Eastern Europe and Central Asia. In the water bodies of Italy, Spain, Portugal, England and China, it is a naturalized alien species that does not have a large number. At first freshwater bream was introduced into the Ob basin in 1862, in the reservoirs of the eastern slope Urals. By the end of the 19th century, bream became common in this region, but spread slowly downstream: in the Lower Irtysh it was noted only in the mid-1920s, and entered the commercial statistics in 1936. It became known in the Middle Irtysh in the 1930s, but it became an object of fishing only in 1963. In the lakes of the Ob-Irtysh interfluve, at first bream was introduced in 1928. In the largest of them, it became naturalized. In the Ubinskoye lake the bream formed a stable self-reproducing population, which served as a source of juvenile bream for resettlement in water bodies of Siberia and Kazakhstan in the middle of the twentieth century. Currently, the bream in the Ubinskoye lake does not inhabit due to the shall owing of the lake. Bream was introduced into the Novosibirsk reservoir in 1957–1960. It quickly became numerous and began to spread up and down the river Ob. It has been known in the Upper Ob in the Altai Region since the early 1960s, and in the Middle Ob in the Tomsk Region since the end of the same decade. Currently, the catch of bream in the Ob basin are maximum in the Bukhtarma reservoir, relatively large in the Novosibirsk reservoir and in the water bodies of the Khanty-Mansiysk Autonomous Region. At the same time, the share of this species in the total volume of fish catch in large reservoirs of the Ob basin is about 80% of the fishing, in the Middle Ob and Middle Irtysh — about 20%, and in the north of Western Siberia — less than 0.5%. The decrease in the share of bream in the fishery from south to north reflects not only a decrease in the abundance of this species in the latitudinal direction, but also an increase in the stocks of native fish species.

Salinization of freshwaters is a serious problem leading to a decrease in biodiversity and degradation of aquatic ecosystems. In conditions of climate warming, the toxic effect of salinization can increase. The aim of this study was an experimental assessment of the survival of the pre-larvae of the Eurasian perch Perca fluviatilis under conditions of different concentration of two types of salt (salt mining wastes and sodium chloride), and also under two temperature regimes. We found that under temperature conditions of 8–15 ° C, the mortality of pre-larvae was significantly lower compared to the values obtained with an increase in temperature by 5 °C. The tolerance limit (LC₅₀) under exposition to salts for 24 hours was a mineralization value equal to 9.8 g/l and 8.7 g/l under an exposition of 72 hours. There were no significant differences between the two types of salts — salt mining wastes and sodium chloride in terms of LC₅₀. There were also no significant differences in the time of death of 100 and 50% of the tested prelarvae. At the same time, a higher mortality of pre-larvae was revealed in solution of salt-mining wastes at concentrations of 7 and 8 g/l. At concentrations above 9 g/l, the opposite trend was observed — a greater mortality rate was found in sodium chloride solution. For both types of salts, a greater survival rate of prelarvae was revealed at a salt concentration of 8 g/l compared to a concentration of 7 g/l, which requires more detailed studies. These results are important for understanding the limits of tolerance to salinity in the larval stage of development of one of the most widespread ecologically flexible freshwater fish species. The relevance of the study is determined by current trends in climate change and the increasing level of salinization of boreal freshwaters as a result of salt pollution.

A study of the fish-breeding and biological characteristics of two- and three-year-old hybrids of third-generation carp and reverse-crossing carp was carried out. As a result, a higher Fulton fatness coefficient was revealed in return-crossing carp, as well as their more effective plastic exchange, characterized by feed payment. The exterior indicators for the progonicity index of both two-year-olds and three-year-olds in return-crossing carp had lower values than in hybrids. Consequently, in this group of fish, as a result of the return crossing of carp hybrids with an improver breed (Moscow scaly), a more pronounced high-spin was observed. The additional calculation carried out for the variation of the studied index revealed slightly lower coefficient of variation in two- and three-year-old carp hybrids than in return-crossing carp, which can be explained by the effect of stabilizing selection during three generations of breeding. The use of such an important indicator as the mass accumulation coefficient made it possible to establish its higher values in two-year-old carp of return crossing. The consequence of such a high weight gain in this repair group of carp may be a significantly lower average weight in yearlings of return crossing when stocking outgrowth ponds (15.8 g versus 88.3 g in third-generation carp hybrids). The highest indicators for the accumulation mass coefficient were noted for both two-year-olds and three-year-olds of two groups of carp in the period from May to June, which corresponded to a more intensive development of the natural forage base in the growing ponds during this period of time.

The intensive development of industrial and amateur fishing, due to the expansion of the range of fish products, as well as the problem of ensuring the safety of fish raw materials, determined the relevance of studying the quality of aquatic biological resources, including microbiological criteria. Samples of muscle tissue of bream, roach, rudd, gaster and carp caught in the river zone in the periods 2010–2014 and 2020–2022, as well as bream and roach in the marine zone in similar periods, served as the material for determining microbiological quality indicators. The quality assessment of the examined fish according to microbiological criteria was carried out in accordance with regulatory documents. In the lower reaches of the Volga River, bacterial contamination of muscle tissue of freshly caught mature carp fish varied within 0.07±0.01–2.42±0.40 thousand. CFU/g. The number of bacteria in the muscles of frozen fish varied from 0.24±0.05–9.34± 0.20 thousand. CFU/g. In the northern part of the Caspian Sea, bacterial contamination of the muscle tissue of freshly caught cyprinid fish varied in the range of 0.14±0.02–4.08±0.84 thousand. CFU/g. The number of bacteria in the muscles of frozen fish varied from 0.13±0.03–5.13±0.65 thousand. CFU/g. Indicator microorganisms (BGCP, staphylococci, salmonella, listeria and parahemolytic vibrions) were absent in the maximum permissible mass of muscle tissue, which, against the background of a low total number of microorganisms, confirmed the satisfactory quality of mature individuals of the surveyed commercial fish species. These species could be used for food without restrictions, with appropriate processing in compliance with the necessary rules and regulations.