The research subject is predatory perch fish (Percidae) inhabiting the Chulym river basin (the right tributary of the middle Ob river) — common perch and common pike perch. If a perch is a native species of the Chulym river basin, a pike perch is a non-native species, which appeared in Chulym river spontaneously spread after its introduction into the Novosibirsk reservoir. Morphological and some ecological features of these fish have been studied. Major parameters of morphology (meristic features) of the Chulym river basin perch and pike perch with those of the populations from other water bodies of the Ob-Irtysh basin have been compared.

The present report presents the results of complex long-term hydrobiological studies, the production of starter feeds (brine shrimp cysts) for aqua- and mariculture from hypersaline lakes of the Altai Territory, which includes cyst preparation during the summer-autumn period, primary cleaning of biological raw materials, activation of raw cysts and their drying. At the same time, the hatching of brine shrimp cysts is controlled, which is a key condition for obtaining high-quality starter feeds with 80–90% hatching. The factors that determine the development of brine shrimp are given and differentiated into internal and external. Critical points of the water mineralization value in hypersaline lakes for brine shrimp populations of the Altai Territory are determined as 30–340‰. On the basis of the long-term monitoring of hypersaline lakes, the zone with optimal water mineralization for brine shrimp is determined as 70–200‰. The limits of sub-pessimum and pessimum zones for the deterioration of the brine shrimp environment conditions are determined as 150–250‰ and, consequently, for the formation of their cysts. Alternation between high water level and low water level is shown on the example of hypersaline Lakes Kulundinskoye and Bolshoye Yarovoye, which determine the conditions for the development of brine shrimp and its breeding performance. The dependence of brine shrimp number and cyst number, as well as the gender structure of the population, during various hydrological periods of water level is determined. It is established that in Lake Kulundinskoye the average annual number of brine shrimps during the low water period decreases, and the number of cysts increases. The average diameter of cysts during the high water period is 230±30 μm, during the low water period it is 240±30 μm. Studies on the change in the gender structure of the shrimp population have shown that males are absent during the low water period.

The assessment of the state of natural reproduction of commercial fish in the waters of the village of Akhmat and the Zolotoye Volgograd reservoir on observations of the yield of juveniles in 2018. As a result of researches it is established that in waters of the village of Akhmat and Zolotoye on number non — field fishes, and on biomass-trade dominated. In General, more favorable conditions for reproduction of commercial fish developed in the waters of village of Zolotoye. The greatest numbers in the waters of the Ahmad reached the bleak, Zolotoye villages — sprat biomass in the waters of Ahmad also was dominated by the bleak, but around the village of Zolotoye asp. The conditions for the reproduction of fish in the water areas in the Akhmat and Zolotoye villages of the Volgograd reservoir should be considered average.

The article provides information on the results of experimental cultivation of rainbow trout in ameliorative ponds using fresh groundwater of high salinity. These studies were carried out in connection with the need to establish the ability of rainbow trout to adapt to non-standard growing conditions, in particular, exceeding the fishery maximum allowable concentrations for a number of ingredients in the water supply source. As a result of the work carried out, it was established that juvenile rainbow trout in conditions of increased salinity of fresh groundwater, while simultaneously observing other fisheries standards for water quality and feeding with highquality feed, demonstrates excellent growth and the absence of any developmental abnormalities. The results obtained allow us to consider the currently poorly used technical quality groundwater reserves as a promising base for the further development of aquaculture in the region.

Work on the assessment of the efficiency of use of probiotic «Sporotermin» method of direct introduction into the water under lo-verificacao cleavage growth of African catfish. The objectives of the study included the assessment of growth and development of fish, indicators of blood, protein and carbohydrate metabolism. The results showed that the introduction of the probiotic «Sporotermin» in the habitat of fish accelerates the growth rate, encourages weight gain, having a positive impact on indicators of metabolic processes in the fish organism. The research was carried out with the grant support of RFFI.

A comparative study of the content of immune complexes and the level of oxidative processes in the liver, kidney and spleen between resistant carp and susceptible to pathogens of rubella was conducted. The studied individuals of rubel-resistant breed reliably differed in high content of total lipids and low levels of lipid peroxidation in the kidneys and antioxidant activity in the spleen. The results indicate the possibility of using immuno-biochemical parameters for assessing the health status of fish in aquaculture.

The comparison of the indicators of the contamination of trematode Ichthyocotylurus variegatus in the perch of the Perch fluviatilis (L.) from the Novosibirsk reservoir over the past five years has been Carried out. It is concluded that the hydrological regime of the Novosibirsk reservoir has an impact on the indicators of perch contamination by the trematode of the variegatus. In years with a low water exchange rate, fish contamination is higher than in years with frequent changes in water masses. In the period from 2011 to 2017 there was an increase in the index of abundance and intensity of invasion. Growth rates of infestation by trematode I. variegatus appears to be associated with the biology of perch and a sharp increase in its population in the reservoir and possible massive implementation in the Novosibirsk water reservoir of the alien gastropod mollusc Viviparus viviparus.

The influence of the probiotic «Bacell-M» on the chemical composition of carp tissues was studied. When conducting research, carp were grown on complete feed, with the addition of different doses of probiotic. As a result of the experiment, it was found that the content of certain groups of vitamins in pond carp under the influence of feed additives in the diet increases. Increased levels of vitamin C and B1 indicate that the feed additive «Bacell-M» has a positive effect on protein-fat metabolism in fish.

The history and current state of stock enhancement programs in North America are reviewed. 7th part of review is devoted to marine species. The North-American hatchery releases of larva of marine fishes began in the end of XIX century and ceased or transformed to commercial farming in second part of XX century but now new marine stock enhancement programs based on growing of fingerlings are developing for recreational fishery and conservation of rare species. The main objects of artificial propagation of marine fishes are red drum Sciaenops ocellatus, snook Centropomus undecimalis red snapper Lutjanus argentimaculatus, sea trout Cynoscion nebulosus, cobia Rachycentron canadum.