YPR: Yield Per Recruit analysis to get FMSY proxy F01

Description Usage Arguments Details Value Functions Required Data Rendered Equations Note Author(s) References Examples

View source: R/MPs_Output.R

Description

A simple yield per recruit approximation to FMSY (F01) which is the position of the ascending YPR curve for which dYPR/dF = 0.1(dYPR/d0)

Usage

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YPR(x, Data, reps = 100, plot = FALSE)

YPR_CC(x, Data, reps = 100, plot = FALSE, Fmin = 0.005)

YPR_ML(x, Data, reps = 100, plot = FALSE)

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?

Fmin

The minimum fishing mortality rate inferred from the catch-curve analysis

Details

The TAC is calculated as:

\textrm{TAC} = F_{0.1} A

where F_{0.1} is the fishing mortality (F) where the slope of the yield-per-recruit (YPR) curve is 10% of the slope at the origin, and A is an estimate of current abundance.

The YPR curve is calculated using an equilibrium age-structured model with life-history and selectivity parameters sampled from the Data object.

The variants of the YPR MP differ in the method to estimate current abundance (see Functions section below). #'

Value

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

Functions

Required Data

See Data for information on the Data object

YPR: Abun, LFS, MaxAge, vbK, vbLinf, vbt0

YPR_CC: CAA, Cat, LFS, MaxAge, vbK, vbLinf, vbt0

YPR_ML: CAL, Cat, LFS, Lbar, Lc, MaxAge, Mort, vbK, vbLinf, vbt0

Rendered Equations

See Online Documentation for correctly rendered equations

Note

Based on the code of Meaghan Bryan

Author(s)

Meaghan Bryan and Tom Carruthers

References

Beverton and Holt. 1954.

Examples

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DLMtool documentation built on Dec. 6, 2019, 9:06 a.m.