We use the Ricker (1954) model of stock-recruitment to represent fish population dynamics because of its availability for the two riverine settings being evaluated." We adapt the Klamath River fall run Chinook salmon stock-recruitment model developed by the Klamath River Technical Advisory Team (
KRTAT 1999) by including more recent data and updating the model to reflect the proportion of Trinity River Chinook run contained in the total Klamath run.