Effort searching MP aiming for a fixed stock depletion

Effort is adjusted using a simple rule that aims for a specified level of depletion.

Usage

DTe40(x, Data, reps = 100, plot = FALSE, alpha = 0.4, LB = 0.9, UB = 1.1)

DTe50(x, Data, reps = 100, plot = FALSE, alpha = 0.5, LB = 0.9, UB = 1.1)

Arguments

x: A position in the data object
Data: A data object
reps: The number of stochastic samples of the MP recommendation(s)
plot: Logical. Show the plot?
alpha: The target level of depletion
LB: The lowest permitted factor of previous fishing effort
UB: The highest permitted factor of previous fishing effort

Value

An object of class Rec-class with the TAE slot(s) populated

Details

The TAE is calculated as: $$\textrm{TAE}_y = \frac{D}{\alpha} \textrm{TAE}_{y-1}$$ where $D$ is estimated current level of depletion and $\alpha$ is argument alpha specifying the target level of depletion.

The maximum fractional change in TAE is specified with arguments LB and UB

Functions

DTe40: Effort is adjusted to reach 40 percent stock depletion
DTe50: Effort is adjusted to reach 50 percent stock depletion

Required Data

See Data-class for information on the Data object

DTe40: Dep, MPeff

Rendered Equations

See Online Documentation for correctly rendered equations

Author

T. Carruthers

Examples

DTe40(1, MSEtool::Atlantic_mackerel, plot=TRUE)

#> Effort 
#>    0.9