DLMtool (version 5.2)

CompSRA: Age-Composition Stock-Reduction Analysis

Description

A stock reduction analysis (SRA) model is fitted to the age-composition from the last 3 years (or less if fewer data are available)

Usage

CompSRA(x, Data, reps = 100, plot = FALSE)
CompSRA4010(x, Data, reps = 100, plot = FALSE)

Arguments

x

A position in a data-limited methods data object

Data

A data-limited methods data object

reps

The number of stochastic samples of the MP recommendation(s)

plot

Logical. Show the plot?

Value

An object of class Rec with the TAC slot populated with a numeric vector of length reps

Functions

• CompSRA: TAC is FMSY x Abundance

• CompSRA4010: With a 40-10 control rule based on estimated depletion

Required Data

See '>Data 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

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.

Examples

# NOT RUN {
CompSRA(1, DLMtool::SimulatedData, plot=TRUE)
# }
# NOT RUN {
CompSRA4010(1, DLMtool::SimulatedData, plot=TRUE)

# }