Simple fixed F harvest control ruleSource:
A simple control rule that explicitly specifies the target apical F independent of any model.
An object of class Assessment with estimates of next year's abundance or biomass.
The number of replicates of the TAC recommendation (not used).
The value of F.
The catch advice is calculated using the catch equation of the corresponding
Assessment@forecast$catch_eq, a function that returns the catch advice for a specified