Factors controlling the year-classes strength for chum salmon <i>Oncorhynchus keta</i> in the Okhotsk district

A quasi-cyclicity associated with variability of environmental conditions is detected for the regression residuals stock-recruitment model chum salmon Oncorhynchus keta in Okhotsk district, described by Ricker’s equation. The main factors influenced on progeny abundance were number spawners and amount precipitation spawning grounds area certain months. mathematical has been developed that simulates satisfactorily dynamics progeny, which can be used forecasting. Role freshwater marine periods life formation year-classes strength discussed.