In 2018, macrozoobenthos of 11 lakes from the Russian Altai were studied. The taxonomic composition and quantitative characteristics of zoobenthos are characterized. Only 41 species of bottom invertebrates from 9 taxon were identified in the studied lakes. Chironomids were the dominant taxonomic group in the studied lakes. The similarity of faunas did not exceed 59% for most lakes. The trophic structure of the studied zoobenthos was characterized, and five main trophic groups of hydrobionts were identified.

This article provides information on the distribution, biotopic distribution, occurrence in net catches, size and age structure, growth, nutrition, puberty, fertility and spawning of zosterops in the Oka river. According to the results of registration surveys by smooth networks, the number and biomass of the white-eye in the Oka river are estimated.

The conditions of reproduction of fishes in the water areas was investigated in the Zolotoye and Akhmat villages of the Volgograd reservoir in 2019. The conditions for the reproduction of fish in the water areas in the Akhmat and Zolotoye villages of the Volgograd reservoir should be considered very unfavorable. In comparison with 2018, the share of perch and crucian carp increased significantly in catches.

The species composition and number of young fish in different parts of the Malye Chany Lake and in the low stream of its tributary (Kargat river) during the periods of high and low water levels (phases of transgression and regression) were studied. 12 species of fry have been recorded in the lakes system. Gudgeon Gobio gobio and dace Leuciscus leuciscus were not observed in the lake’s fish community during the regression phase; spawning areas of ide Leuciscus idus, sunbleak Leucaspius delineates and three species of crucians (Carassius carassius, C. auratus, C. Ghibelio) were reduced, but the proportion of fish which are adapted to mineralization (roach Rutilus rutilus, bream Abramis brama, pike-perch Sander lucioperca and perch Perca fluviatilis) increased and the dominant group was composed by these species. The total number of the young fish was decreased more than 45% in low-water conditions.

The selection of producers of various groups of carp was carried out according to their reproductive indicators and the results of offspring growing. According to the results of studies, the most promising heterogeneous group of carp for further selection activities was established.

In this article materials on expediency of cultivation of carp with a continuous scaly cover in 1 and 2 zones of fish farming are stated. The basis for such conclusions was their higher search capacity (use of natural potential, water lands), which allows to save feed. At the same time, the carps of the scaly group have a more stable immune system (according to the immune complement and bactericidal activity of the blood serum), which allows to obtain large yields from wintering. In General, economic factors are the determining factor in the cultivation of carp with different scales.

Under aquaculture and natural habitat conditions, a greater number of fish species is found to be contaminated with the virulent strains of Aeromonas hydrophila, A. sobria and A. caviae that are the causative agents of aeromonosis. Due to the aeromonosis of carp (this species is a priority object of pond aquaculture in the South of Russia), fish farms suffer significant losses. The aim of our research is to study the species composition of aeromonads observed at the carp farms in the southern Russia and the changes in the metabolism of the fish affected by aeromonosis, which can be an important component in solving the problem of preserving fish health. The processes of free radical oxidation are shown to be activated in the body of the carp affected by aeromonosis, moreover, lipid metabolism and the balance of prooxidants and antioxidants are disturbed.

30–31 января 2020 г. ведущие представители аквакультуры в России собрались в Москве, в отеле «Бородино» на V Международной конференции «Рыба 2020. Технологии рыбопереработки и аквакультуры». Были приглашены к участию специалисты, занимающиеся аквакультурой, производством кормов и оборудования для выращивания рыбы, ветеринары, селекционеры, а также переработчики и логисты. Участниками конференции стали представители Федерального агентства по рыболовству и ассоциаций рыбопромышленников, российские и иностранные эксперты-практики, рыбоводы, специалисты по продвижению продукции и эксперты по регламентам, ученые, агростраховщики, специалисты по кормам и селекционеры.

In XXI century the countries of former USSR and IR Iran lost wild stocks of sturgeons but commercial farming in all these countries, except Armenia developed slowly in comparison with China or Vietnam. The share of Russian Federation is only 5–6 % of world production of sturgeon flesh and 10–15 % of caviar. The main feature of sturgeon farming in Russia and some other post-soviet countries is non-lethal method of roe striping which does not allow to produce caviar of luxury quality.