The development of fish farming is noted as one of the priorities at the state level. There is an increase in subsidies allocated for these purposes, commercial banks are actively financing projects to create private fisheries. As a result, there is a need to reduce risks and protect investments. One of the most effective tools to protect fish farmers from production risks is insurance. The paper describes the current state of insurance of aquaculture objects. It is noted that the market is represented only by commercial insurance of aquatic organisms, and insurance with state support will begin to be applied only from 2019.

In the first years after the creation of the reservoir ruff was among the most numerous species and experienced difficulties with food. Mass of fish at the age of two years was 1.5 g. Fingerlings were fed zooplankton, insect larvae, oligochaetes and molluscs. In subsequent years ruff was in negative dependence from walleye and often served him feed. In the 1980s, the forage base of the ruff stabilized. He showed himself as a typical benthic feeder, the main role in the diet belonged to chironomids, in second place acclimatizate — Baikalian gammarids Gmelinoides fasciatus and Mshigeni possolskii. In 2000-ies the main food was mizidy that met 100% of the fish. Aboriginal food accounted for 10% of the total volume of the food lump.

The results of studies on the impact of recreational fishing on aquatic bioresources in the Astrakhan region are presented. The number of Amateur fishermen who visited the water bodies of the region, the intensity of Amateur fishing, the species composition of Amateur fishing facilities, their biological characteristics and the volume of catch of aquatic biological resources are determined. It is shown that Amateur fishing is a significant factor affecting the modern reserves of aquatic biological resources of the basin. Every year, the volume of withdrawal of aquatic biological resources from recreational fishers is estimated at an average of 7.4 thousand tons, or about 20% in excess of statistical catches. The basis of their catches are the most liquid fish species.

Rational fisheries on natural bodies of water should ensure the exploitation of the ecosystem of the reservoir as a whole. Failure to take measures to purposefully regulate the environmental situation in closed reservoirs will inevitably lead to the reconstruction of the ichthyofauna in the direction of low value and tightness of fish, a progressive decrease in the fish productivity of lakes and a complete loss of their fishery significance. The aim of the research was to clarify the current state of the biota of oz. Gorko-Peresheechnyy Egorevskij district, Altai Krai. The lake is located in the valley of the ancient river drain. Barnaul, the nature of water exchange refers to low-flow. The area of the reservoir is 4540 ha. Average water depths of about 1.5 m. the Maximum depth observed in the Central part of the lake and stands at 2.9 m. Mineralization of water in the reservoir is subject to considerable fluctuations and is determined by the interannual change of phase of water availability and the intensity of insolation during the vegetation period. The zooplankton of the lake is represented by three groups of organisms: rotifers (Rotifera), cladocerans (Cladocera) and copepods (Сopepoda) crustaceans. During the whole period of observation, larvae of Chironomidae, oligochaetes (Oligochaeta) and Mollusca form the leading role in zoobenthos. The ichthyocenosis of the lake is represented by prussian carp Carassius auratus (Linneus, 1758) and perch Perca fluviatilis Linneus, 1758.

The effect of photoperiod duration on spawning efficiency and physiological and biochemical parameters of blood of reciprocal hybrids of tilapia of the genus Oreochromis (red tilapia) was studied in the experiment. Three selections of fish and 28 copies were kept in three aquariums of 400 l, when the ratio of males to females was 1:3. We studied the influence of three different photoperiods: 18 h light, 6h-darkening, 6 h-light, 18 h-darkening and photoperiod-12h-light, and 12 h — darkening. Analysis of the experimental data showed that the 12-hour photoperiod leads to an increase in the efficiency of spawning red tilapia breeders. In particular, the average working fecundity of females and the number of spawns in the broodstock increased. The content of β-lipoproteins in the blood of fish increased significantly. That indicates the activation of generative exchange under the influence of 12-hour photoperiod. 18 hours of light a day, by contrast, has had a depressing effect on the fecundity and number of spawning females. This photoperiod led to a significant increase in cholesterol in the blood of fish. Thus, it was concluded that the 18-hour period of lighting is a stressful factor for red tilapia breeders.

Examination of the Russian sturgeon for the purpose of assessment of their physiological state is conducted by method of the morphological analysis of biological liquids (a edge dehydration). For verification of the obtained data the key hematological and biochemical indicators of blood of fishes were defined. The informational content of a method of a regional dehydration at assessment of a physiological condition of fish and her adaptation opportunities is established.

Currently, in Russia, the gene pool of African Clary catfish is formed by a variety of genetically heterogeneous populations, which have significant phenotypic and genotypic differences, since the breeding material was purchased uncontrollably from geographically isolated populations of many countries: Ukraine, Poland, Germany, the Netherlands, Israel, Egypt. In the conditions of our laboratory we grow African Clary catfish, the planting material of which was originally purchased in the Netherlands and Poland. The aim of our research was to estimate the growth rate of the offspring of these two geographically isolated populations. The results of studies showed that the offspring of the population from the Netherlands was characterized by significantly higher growth rate. Intra-group variability in weight indices in both populations was high at all stages of ontogenesis, indicating their genetic heterogeneity on this basis of productivity. The research was supported by the Russian Foundation for Basic Research under grant 18-416-730005.

This article focuses on wintering, spawning maintaining and brood stock building of the blue tilapia spawners during the spawning campaign in the RAS. The studies of selection of the blue tilapia spawners have been performed with the aquaculture method and the brood stock building has been carried out in the proportion 5 females to a male. The findings about rational selection of the brood stocks and stress load reduction have been represented. The data of the spawning with the random and natural method of selection have been shown. The effective female fertility in conditions of the random selection (23 fish eggs) of spawners and the spawning with the natural building of stocks (179 fish eggs) has been depicted. The sub lethal temperature during maintaining the blue tilapia younger remount in ponds has been determined.

The aim of the study was the evaluation of the natural and social risk factors of infection with opisthorchiasis in the western regions of the Krasnoyarsk Territory which are located in the Chulym River basin for the effective prevention of the morbidity of this infection. A parasitological study of fish the family of carp (family Cyprinidae) was carried out, quantitative indicators of infection were determined. The results are compared with the data on the incidence of opisthorchiasis, with observations of climatic, landscape features of the studied areas, features of the way of life of local inhabitants. The analysis of the social factors of Opisthorhis felineus (Rivolta, 1884) spreading, from our point of view, showed their defining role. The way of life of the population, the process of urbanization, which involves the improvement of sanitary culture, the development of medical network and educational work, can reduce (allow) the risk of the infection with the opisthorchiasis even in the presence of a natural focus.