The article presents data on the areas of fisheries activities in the country, the volume of fish production, its structure. The necessity of selection and breeding work within breeding and genetic center as part of RUE «Fish Industry Institute». Creating a farm - originators and Genetic Selection Center for carp will ensure quality in thoroughbred breeding material of all fish farms of the country.

The paper estimates the occurrence  of Cestoidea  class representatives   – causative agents of parasite diseases of fish inhabiting natural reservoirs and reared in fish farms of the Republic of Belarus.

At the result of comparative analysis of fishery indice of the 1st generation of one year old fishes of two breeding lines of Belarusian mirror carp represented by 18 families there were discovered the most productive groups which are distinguished with increased growing rate and survivability.

There are presented the selection methods of repair junior groups of selected Belarussian mirror carp by independent borders and a selection index. It is suggested   to   apply   the   the   selection   methods   by   independent   borders   for phenotypical, exterior propeties and selection be selection indices by the complex of fishery indices, respectively.

There is provided the characteristic of   mass accumulation and survival indices of two-year-old fish within 18 families of the Ist  generation of two lines of Belarusian mirror carp. On the grounds of  complex evaluation  there were distinguished the families having increased grown rate at the said stage of growing.

The paper provides the results of investigating the fertility of carp females of Belarussian selection lines and some breeds imported to the Republic of Belarus. High variability of females by indices of working fertility and relative working fertility made it possible to create a group featuring an increased fertility which represents a gene pool for further selective breeding programs.

In the paper there were designed the formulae for analyzing and complex evaluation of   piscicultural results on carp stock breeding. The results obtained display the efficiency of growing process. There was developed the growing model for 175 days for pedigree one year old carp individual. If the growing period is extended to one year and comfortable keeping conditions are maintained, the mass of one year old carp individual may attain 1,7 kg. It is confirmed by calculations in growing model that inreality average mass of two year old carp fish makes 660 g  and more. Pedigree material of two year old carp fish used for supplementing the mother stock increasing generation attains 1 kg mass.

In experimental conditions there was studied the influence of chemical desorbents (sylvinite, potassium chloride, slaked lime) at mobilization of biogenic substance from bottomset beds.

There was studied the need intensively operated pond ecological systems in mineral fertilizers. It is shown that due to internal resources the pond ecological system is quite capable of efficient functioning without mineral fertilizers being used.

The paper covers the results of growing sterlet larvae at starting combined  feed  using  feed  additive  Mix-Oil.  There  was  ascertained  favorable influence of Mix-Oil additive making part of the feed, mass accumulation and vitality of sterlet larvae grown.

The paper studies the influence of vitamins injections during prespawning period on hematological indices of sterlet spawners, on the quality of the obtained reproductive products and impregnation capacity of spawn.

The paper provides the results of biochemical and hematological investigations of trout fingerlings while using the feedstuff of domestic production. It was ascertained that the domestic feedstuff has favorable impact on physiological state of fish and quite suitable for replacement of  the imported feedstuff.

The investigations showed that growing of carp seeding at sparse stockings allows getting the material of better quality as compared to intensive technology of fish breeding.

In the conditions of incubatory shop when feeding with a live food for 12 days of growing at water temperature 19-220C body mass of paddlefish tiny fishes increases from 35 mg to 1 g at breeding output 42-47%. Interchange in feeding the tiny fish with animal plankton and compound foodstuff, for next 10 days of breeding at seeding density 500-600 pcs/m³  ensures obtaining four kilo tiny fishes from 1 kilo tiny fish with feeding output 76-82%.

Summer fattening of ten year old paddlefish may be done in fattening ponds together with commercial growing of carp and grass carp (Ctenopharyngodon idella). When seeding increase from 3 to 10 pcs./hectare there is observed reduction of average daily increments, specific growing rate and mass accumulation ratios. Mass of of ten year old paddlefish 11,2 - 12,9 kg, total increment of body mass makes 0,8 - 1,1 kg, fattening output makes 100%. For creation of favorable feeding conditions and good increments of paddlefish average seasonal zooplankton biomass in the ponds should make at least 15 g/m³.

There were studied hematological indices heterosexual eight year old individuals of  paddlefish at various maturity stages grown at Self-Financing Site “Vileika”, Minsk region. For paddlefish males as compared to paddlefish females there was noted higher saturation of organisms with hematoglobulin, greater quantity erythrocytes in red blood and leukocytes in white blood. Our data confirm the trend of increasing hematological indices with paddlefish at various maturity stages.

There is shown data on experimental growing of  whitefish tiny fishes in conditions of indusytial basin complex. It is shown the possibility of simultaneous   two kinds of psychrophilic fishes. The conditions of industrial basin module if  adequate nutrition is ensured allow growing of whitefish tiny fishes with efficiency indices exceeding other methods at natural temperature conditions.

From among heavy and toxic metals in muscles of bleak, roach and perch from the Chizhovsky reservoir (Minsk) there is zinc in large quantities, the second and the third places occupy iron and copper accordingly. Researches have shown that the muscular tissue of perch contains the greatest quantity of metals fixed by a spectrometer, and concentration of the majority of them is a little above, than in bleak and roach. However concentration of priority pollutants (zinc, iron and copper) above in muscles of bleak and roach.

There were studied some peculiarities in dynamics of quantity and biomass of zooplankton communities of littoraly of two small  eutrophic lakes. There are  investigated  probable    mechanisms  of  community  structure  variation  under impact of preying of tiny fishes and dependence upon degree of macrophytes overgrowing.

Introduction of   pikefish early tiny fishes into hyperthrophic lake with intense gas conditions made it possible to form self-reproducing population and to  arrange  its  trade  operation.  The  success  of  the  action  was  promoted  by considerably long favorable period, availability of reproduction sites and localization of pikefish during subglacial period and slackening of competition on the part of native prey fish.

It was ascertained that the density of bulltrout (salmon trout) tiny fishes made in the stream of Tartak from 37 to 70 individuals per 100 meters of watercourse, in the river Kimelina of 9-10 individuals, in the river of Dudka from 2 to 5, in the river Senkanka – 1-3 individuals. In terms of age in 2010 two year old fishes were predominating, 2011 – one year old fishes that apparently is attributed to low productivity of young fishes in 2010. Beaver ponds to some extent appear to be fattening water reservoirs for salmon tiny fishes mainly for the age of two and three years old, the density of tiny fishes in natural river bed is 2–7 times higher against the beaver ponds.

The paper provides the data about the quantity of beaver ponds, quantity and location of spawning hillocks of passage salmon fishes (Brown trout and Atlantic salmon) on two spawning waterways – the Tartak stream and the river of Dudka (inflows of the river of Vilia, basin of the Baltic Sea). There were estimated the influence produced by quantity and capacity (height) of beaver dams on the results of spawning campaigns. It was ascertained that the building activities of the beavers has significant impact on the conditions of reproduction of salmon fishes: the dams appear to be an obstacle for migration of salmon spawners and the sections of waterways occupied by the ponds get unsuitable for spawning of salmons and thus the spawning areas are reduced.

On the basis of studying foreign and domestic literary sources there were  investigated  varios  aspects  of the influence produced  by  Cayprinus  carpio Linnaeus on the ecological systems of water body.

In the course of two year investigation cycle there was estimated the content of seston and chlorophyll in large and small stream flows in North-West of Belarus related to the Baltic Sea basin. There was compared seasonal dynamics of the indicators   studied,   calculated   specific   chlorophyll   content   in   seston   and phytoplankton. Taking into account the data obtained the river Vilia is classified as eutrophic waters whereas other rivers pertain predominantly to mesotrophic stream flows.

There are depicted the causes of displacement of indigenous crucian carp by introduced goldfish and there are suggested the measin Belarusian ponds are shown and actions for conservation of aborigine species are offered.