Supporting Code for: An approach to defining a Sacramento River Fall Chinook escapement objective considering natural production, hatcheries, and risk tolerance
Description
Supporting code and input data for: An approach to defining a Sacramento River Fall Chinook escapement objective considering natural production, hatcheries, and risk tolerance. I offer a modeling framework for integrating consideration of established hatchery spawning goals, natural-area production or habitat capacities measured at varying spatial scales, and policy decisions about what fraction of potential natural production is desired and risk tolerance. The model allows evaluating how likely a potential escapement goal (measured at the currently-used scale of fall run adults returning to both hatcheries and natural areas throughout the Sacramento Basin) is to both meet hatchery goals and to produce at least a specified fraction of potential natural production.