The data describing the demand and preferences of the population   of Belarus for certain fish species are given. Advantages and disadvantages of industrial fish farming. New necessary directions of scientific researches for stabilization of fishery activity on maintenance of the population own fish are shown. The possibility of the institute in the reproduction of carp, valuable and aboriginal fish species of Belarus is shown.

A comparative assessment of the ratio of edible and inedible body parts and the biochemical composition of the muscles of two years of breeding carp with an average level of indicators of collection breeds of different origin has been carried out. The article presents the results of a study of the ratio of body parts and muscle composition of two-year-old carp of different pedigree affiliation.

The article presents the results of a comparison of the biochemical composition of the muscles of two-year-old dvuhporodnyh cross with breeds and lines of carp of different  origin and  Amur carp. Combinations  characterized by elevated levels of dry matter, fat, protein compared with the average population value, the average level of collection Belarusian lines, imported breeds and Amur carp, grown under the same conditions were established.

As a result of the study of the ratio of body parts of two-year-old double-breed crosses obtained from the crossing of adapted fourth-generation imported breeds grown in Belarus with carp lines of Belarusian breeding. A comparative assessment of the ratio of edible and inedible body parts of two-year cross carp.

The article presents the results of a study of the ratio of body parts   of two-year-olds of collection carp breeds  of  the  Belarusian,  foreign  breeding  and Amur sazan of the Khanka population. A comparative assessment of the ratio  of edible and inedible body parts of two-year-old carp of different pedigree belonging to two generations has been carried out.

The article presents the results of a comparative comprehensive assessment of the biochemical composition of the muscles of two­year­olds of different pedigree affiliation and Amur carp of two generations. Statistically significant differences between breeds and lines of carp, as well as Amur carp on the content of dry matter, moisture, fat, protein, mineral substances in the muscles of two­year­olds were established.

The article deals with the results of a study of genetic polymorphism in populations of narrow-clawed  crayfish  in  the  lakes  of  Sominsky  and  Oltush of Brest region for two mitochondrial genes. It is shown that, in general, the COI gene is characterized by a fairly low intraspecific genetic variability. It was found that in crayfish population from Lake Oltush, it was 1.4 times lower than that of crayfish population from Lake Sominskoe (1.42 % and 2.04 %, respectively). Concerning the 16s rRNA gene, a very high level of polymorphism in the populations of crayfish was established for both lakes (25.6 % for Lake Sominskoe and 60.1 % for Lake Oltush).

The article presents data on the results of the experimental cultivation of marketable products cleavage soma and everbearing strawberry in green-house conditions aquaponic system on the basis of RAS. Studies have shown that  the cultivation of commercial products of Clary catfish in the greenhouse valve system of RAS is possible in a short time, the assembled system of aquaponics based  on RAS showed good results, expressed in the ease of Assembly and operation,   low cost (in terms of electricity, water and human resources) and efficient operation, the cultivation of strawberries in the greenhouse repair aquaponics system is possible, however, there are both advantages and disadvantages: the growth of green mass was very intense.

The technological schemes of breeding the good production of white fishes in large fishing water-basins with using the methods of pasture aquaculture with putting in by larvae and by one-years bred in ponds are presented in the article. The Coregonus albula, Coregonus peled and Coregonus lavaretus are using as the model objects. The calculations of factorial cost of the model objects by the putting in by larvae and by one-years bred in ponds are presented. The cost of one-years of the model objects like a fish-putting material was calculated in advance. The fact that hand-made reproduction of reserves of the Coregonus albula, Coregonus peled and Coregonus lavaretus in large fishing water-basins of Kazakhstan is profitability, is defined.

In  the  article,  data  is  provided  through  the  technologies,  such  as a cultivation of three-year-old pike perches in polyculture with a carp and the herbivorous in ponds of fish-breeding farms in the territory of Almaty region. There has been presented the real possibility of qualitative products’ cultivation in the condition of fish-breeding farms in South Kazakhstan region. The received results can be applied in fish-breeding farms of Kazakhstan for the cultivation of a pike perch products.

The possible parameters of the standard mass accumulation model  of the Siberian sturgeon are considered, namely, the value of the genetic coefficient and the function of the productive effect of temperature. The calculated growth trajectories of the Siberian sturgeon with different combinations of external factors    are discussed. Particular attention is paid to the limiting effect of temperature and density of landing.

The pond method of cultivation of valuable species of fish, such      as sturgeon, has not been widely developed due to low efficiency, so proposals      for the intensification of biotechnological processes in ponds are in demand. It is shown that the cultivation of Bester in polyculture with herbivorous fish contributes to the improvement of hydrochemical and hydrobiological regimes in ponds, which leads to an increase in fish-breeding indicators of sturgeon. Thus, with a planting density of 2500 piece/ha of Bester and 800 piece/ha of herbivorous fish, the percentage of output, average weight  and  fish  productivity  of  sturgeon  fish increases, and in addition, commercial products of white, motley carp and grass carp are obtained.

The data on the cultivation of vinegar nematode (Turbatrix aceti)    on different nutrient media and comparative data on the use of vinegar nematode    as a feed for the young of the North African catfish is presented in the article.        As a result of the research, it has been established that the use of vinegar nematode as a feed for the North African catfish (Clarias gariepinus) is also economically feasible. As a result of the research, it has been established that the use of vinegar nematode as a feed for the North African catfish is also economically feasible. The most productive nutrient medium based on oatmeal with the addition of carrot and vitamin preparation “Revit” was determined in the ratio of 10: 3: 0.1. Feed factors for different feeding options were determined with the addition of vinegar nematode and artificial food (value of feeding coefficient was 2,0 units), addition of decapsulated eggs of Artemia and artificial food (2,45 units), and only artificial food (2,3 units).

The article presents information about the possibility of using in the feed for carp cereal flours. Four composite mixtures were composed, their chemical and amino acid composition was studied. Experimental feeding of fingerlings   of carp by the developed mixes is carried out, their superiority in comparison with grain of wheat is established.

The comparative characteristic  of  filmy  and  bare  oats  is  given. As a result of the research, the possibility of using the studied oats in the production of animal feed for fish was established. When feeding carp, preference is given to animal feed with the addition of membranous oats.

Results of a  wintering of fingerlings of the  carp who is grown up  on compound feeds with introduction of natural mineral additive trepel are given    in article. It is established that use of trepel in compound feed promotes the best expenditure of the saved-up fatty stocks during a wintering.

This article informs about the results of the use of different doses     of protein additive “Extra” in the nutrition of fingerlings of two and three year old carp.

We found out that if we use protein additives in the doses up 4 % in the fodder for fingerlings and 8–9 % in the fodder for two-three year old carp, the growth rate increases. It should be mentioned that in these doses minimum fodder costs were found in comparison with monitoring.

The results of the content of various forms of phosphorus in the bottom sediments of nursery and feeding fish ponds in Belarus are presented, the phosphorus reserves in fish farms of the republic are calculated, correlation dependences of the phosphorus and biogenic elements in the sediments are found.

As a result many years of research conducted in the framework        of international, fundamental and innovative scientific projects, we have developed system of fish-breeding and physical-biochemical methods of regulation of fish reproduction in recirculating aquaculture systems to address the problem of providing the people of high-quality fish.

For the first time it found that the dorsal scutes of maturing sterlet have significant morphological differences depending on sex. Classification models for sterlet sex determination based on machine learning algorithms have been developed. The obtained results are promising for the development of the method of intravital identification of the sex of representatives of Acipenseridae, in the early stages of gametogenesis.

It  was  established  for  the  first  time  that  the  stimulating  effect  of low-intensity optical radiation on aquaculture objects (rainbow trout) depends on the multiplicity of the effect and the temperature regime at which the embryos are exposed and incubated. It is proved that the biological effect on embryos and larvae of rainbow trout can be provided by polarized radiation from both a semiconductor laser and the polarized  radiation  from  an  LED  source  whose  coherence  degree is almost 10 times smaller. New parameters for the regulation of fish-biological parameters of the rainbow trout stocking material based on daily exposure to low-intensity optical radiation (red spectral range λ = 630 nm, coherence length L_co ~ 26 μm) on fish embryos at the ocellus  stage with daily exposure for 20 minutes for 5 days, at a power density of optical radiation of 3.0 mW/cm², at an incubation temperature of 8 °C.

To increase the antioxidant activity, drugs that has the following Properties are used: tartaric acid, citric acid, ascorbic acid, boric acid, zinc and some others. When comparing the influence of these substances on the preservation of sperm, maximum effect exerted tartaric acid, boric acid and zinc. By adding these substances in sperm serum, it extends the shelf life of sperm to 20-30 days. Addition   of boric acid (at concentrations 250–100 mg/L) was influenced by the concentration of protozoa parasites reducing them to 100 times compared with the tartaric acid, zinc and 1000 times - compared to a control group, what contributed to percentage increase and mobility of spermatozoa.

The study determined the features of caviar incubation and early development of the brook trout under the conditions of mountain cold water farming.

The  current state  of  trout  management  in  Ukraine is  undergoing a new stage of rebirth after 20 years of decline. Each year in Ukraine grown about 1500 tons of commodity trout. However, the needs of the Ukrainian consumer market in salmon are currently about 8.5 thousand tons, of which the share of rainbow trout is about 3 thousand tons.

The present state of native regional endangered fish species is described. Some actions that contribute to their survival is proposed.

This article presents materials on the current state of the hydro-hydrochemical regime of the Ural River, within the Western Kazakhstan region. The hydrographic network of a catchment basin, annual fluctuations of level of the river, results of hydrochemical water analysis are given.

The flow regulation of the Dniester foothill part led to adaptive changes in the exterior of various fish species, including Rutilus frisii. The nature   of changes in the body proportions is associated with some deterioration of the hydrodynamic and locomotor properties of fish due to the decrease in the rate of water flow in the reservoir.

The production tests  of  three preparations  new  for  fish  industry of Belarus: probiotic Emilin, phytopreparation Leoledum and antibiotic Levoloks have been carried out. The obtained results confirmed their efficiency against bacterial diseases of Acipenseridae and Cyprinidae, and disease of Acipenseridae caused by Trichodina.

The results of the main hematological indices for the study of the physiological state of fish – the main objects of aquaculture in Belarus with Diplocid in laboratory setting have been presented. The medicineswere used in various ways – the method of group feeding, the method of therapeutic baths, the method of processing fish in ponds. The main blood indices – hemoglobin, number of erythrocytes and leukocytes, erythrocyte sedimentation rate, hematocrit, total serum protein were studied.

Different handbooks on laboratory diagnostics of bacterial infections used at present, became out of date, they do not take into account the structure       of facultative-fishpathogenic bacteria being etiologically agents of the Bacterial Hemorragic Septicemia (BHS), what hampers the process of agents identification and accordingly the correct diagnostics. The offered schema for isolation and identification of agents has been using for many years in the ichtiopathological laboratory of FSBSI “VNIIPRKh” and allows to carry out diagnostic investigations at the sufficiently high level of severity.