Ecological Systems and Devices Annotation << Back MODIFICATION OF THE MODEL OF REPRODUCTION OF STURGEON POPULATIONS IN VIEW OF THE IMPERMANENCE OF GROWTH RATES OF THEIR YOUNGER FISH A.Yu. Perevaryukha In this article we carry out expansion and improvement of models of formation of sturgeon stocks, based on the formalization of the effectiveness of their reproduction. In previous work we have paid attention to the immediate change in survival at three stages of development, the improved model are considered in detail the reasons for sudden changes in survival rates associated with the nature of the accumulation of biomass generation. It is expected that one of the three stages of development after the transition to active feeding slows down the growth of individuals because of the increased density. The mathematical description of the size of the fi sh at the earliest stages is proposed to formalize a hybrid dynamic system based on redefi ning the structure of differential equations. Model impermanence growth rate of juveniles in the system supplements the basic equation of the rate of decrease generation. Keywords: modeling population processes; the model of growth of fi sh species; hybrid dynamic systems; stages of development; the reproductive potential. Contacts: E-mail: temp_elf@mail.ru Pp. 25-34.