Abstract. At the rainbow trout farm in the Namangan region of the Republic of Uzbekistan, primary materials on the effectiveness of rainbow trout cultivation in the period from fertilized to marketable weight of trout imported from France were analyzed at different times of the year. In autumn, it was shown that the import of rainbow trout with paternal caviar and the passage of the inbreeding period in the Namangan region allows the larvae hatched from it to overwinter and get a more adapted fish for subsequent breeding periods. These data indicate that in order to obtain a sufficient amount of marketable products in the Namangan region, it is necessary to take into account all factors and plan the supply of caviar in the optimal time.