Model of Salmon Age Structure and Its Use in Preseason Forecasting and Studies of Marine Survival

摘要: A method is derived to determine whether ocean abundance of a salmon stock affects either the survival rate between particular ages or proportion population which migrates back freshwater spawning areas. The approach, similar Fredin's smolt indices method, uses data on brood-year contributions adult returns in successive years. Survival and maturing are found be independent after age 3, except Naknek River sockeye (Oncorhynchus nerka) data. In cases such as Babine Lake salmon, where nonlinearity has been identified previously relation total returns, this lack density dependence older means that mortality processes cause act early life. relations n year t n + 1 from same brood class t + 1 useful preseason forecasting techniques. here, wh...