Age-Composition Stock-Reduction Analysis
CompSRA.Rd
A stock reduction analysis (SRA) model is fitted to the age-composition from the last 3 years (or less if fewer data are available)
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?
Value
An object of class Rec-class
with the TAC
slot populated with a numeric vector of length reps
Details
A stock reduction analysis (SRA) model is fitted to the age-composition from the last 3 years (or less if fewer data are available) assuming a constant total mortality rate (Z) and used to estimate current stock depletion (D), \(F_\textrm{MSY}\), and stock abundance (A).
Abundance is estimated in the SRA. \(F_{\textrm{MSY}}\) is calculated assuming knife-edge vulnerability at the age of full selection.
The TAC is calculated as \(F_\textrm{MSY} A\). CompSRA4010
uses a 40-10
harvest control rule to reduce TAC at low biomass.
Functions
CompSRA
: TAC is FMSY x AbundanceCompSRA4010
: With a 40-10 control rule based on estimated depletion
Required Data
See Data-class
for information on the Data
object
CompSRA
: CAA, Cat, L50, LFC, LFS, MaxAge, Mort, steep, vbK, vbLinf, vbt0, wla, wlb
CompSRA4010
: CAA, Cat, L50, LFC, LFS, MaxAge, Mort, steep, vbK, vbLinf, vbt0, wla, wlb
Rendered Equations
See Online Documentation for correctly rendered equations
Examples
if (FALSE) {
CompSRA(1, MSEtool::SimulatedData, plot=TRUE)
}
CompSRA4010(1, MSEtool::SimulatedData, plot=TRUE)
#> TAC (median)
#> 3944.184