Features of cultivation of repair and breeding herd sturgeon fish with the application of new highly effective pre-spawning feed

Currently, the development of domestic feed production is in a state of stagnation. In this regard, fish-breeding enterprises have an urgent need to purchase feed abroad. However, imported feed has a fairly high cost, and their composition does not fully meet the physiological needs of sturgeon, as well as the conditions of their cultivation. In addition, in foreign feed quite a high concentration of fat (over 25 %), which requires more careful monitoring of compliance with the terms and rules of storage. In industrial conditions, sturgeon producers are fed with feed mixtures, which are a mixture of granulated feed and minced meat. The composition of this feed mixture throughout the life cycle of producers remains unchanged and does not take into account the physiological characteristics of fish before spawning and during their post-spawning adaptation. In the period of gonadogenesis be aware that the feed must strengthen generative processes in the body [1]. Feed for sturgeon should contain in its composition the main nutrients that are structural elements and sources of energy in the body, as well as vitamins and vitamin-like substances. These substances take an active part in metabolic processes, contribute to the growth and development of the body and stimulate the formation of gonads [2, 3]. Vitamins are a group of low-molecular organic compounds with high physiological activity in the body of fish, as well as an important element of enzymes that affect the processes of transformation of proteins, fats and carbohydrates [4]. However, it is necessary to take into account that for the normal course of metabolic processes in the body, the ratio between the main nutrients and vitamins is a fundamental factor. Thus, if the feed does not meet the needs of a certain type of protein, the addition of vitamins to its composition will be irrational and will not have a significant impact on the growth and development of the body. The introduction of synthetic vitamin preparations into the compound feeds can only make up for the lack of natural vitamins, but not replace them [5]. The scientific article presents the results of the use of a new highly efficient pre-spawning feed for sterlet producers. It is established that the developed compound feed has a positive impact on the reproductive performance of sturgeon, in particular, it helps to accelerate the maturation of females, increase fertility, egg size and the percentage of fertilization of eggs.