Regularities of reproduction for fall Chum salmon Oncorhynchys keta from the Аmur river

The dependence of the number of progeny of the Amur fall chum salmon Oncorhynchys keta on the number of parents was analyzed. It is shown that the deviations of the actual number of offspring from the theoretical ones, calculated by the Ricker equation, depend on the belonging of the fish to a particular generation. An equation is proposed that describes the dependence of the number of progeny of the autumn chum salmon on the number of parents and reproduction conditions. The problem of the variability of the optimal number of parents due to the change in reproduction levels is discussed.