The Ob river basin was replenished with fish again. PJSC “RussNeft” released 397.5 thousand of peled small fry and 44.5 thousand of nelma small fry. The company has been engaged in arrangements as such for more than 5 years. The release of small fry into the reservoir is carried out under the supervision of specialists from the Tyumen branch of the All-Russian Research Institute of Fisheries and Oceanography. The reproduction of nelma, a famous representative of the salmon family, is necessary to maintain the biobalance of the region. Nelma is on the verge of extinction, as, for example, is the muksun, the quantity of which has decreased by more than 30 times in the rivers of the Ob-Irtysh basin over the past 35–40 years. As experts say, without intensive artificial reproduction and solid investments, the situation will not return to normal on its own. The volume of PJSC “RussNeft” investments in the stocking of the Ob-Irtysh fishery basin this year alone amounted to RUB 5.37 million. The annual stocking of fish in the regions of oil production makes it possible to systematically restore aquatic biological resources affected during the development of deposits in Western Siberia. Measures for the artificial reproduction of aquatic biological resources were carried out by PJSC “RussNeft” as part of the implementation of projects developing Tagrinskoye and Verkhne-Shapshinskoye fields. According to scientists, such activities will restore the number of fish in the next decade.