HCR_MSY: Harvest control rule to fish at some fraction of maximum...
In SAMtool: Stock Assessment Methods Toolkit

HCR_MSY

R Documentation

Harvest control rule to fish at some fraction of maximum sustainable yield

Description

A simple control rule that specifies the total allowable catch (TAC) as a function of the abundance of the first projection year and some fraction of FMSY/UMSY.

Usage

HCR_MSY(Assessment, reps = 1, MSY_frac = 1, ...)

Arguments

`Assessment`	An object of class Assessment with estimates of FMSY or UMSY and vulnerable biomass in terminal year.
`reps`	The number of stochastic samples of the TAC recommendation.
`MSY_frac`	The fraction of FMSY or UMSY for calculating the TAC (e.g. MSY_frac = 0.75 fishes at 75% of FMSY).
`...`	Miscellaneous arguments.

Details

The catch advice is calculated using the catch equation of the corresponding assessment. See Assessment@forecast$catch_eq, a function that returns the catch advice for a specified Ftarget.

Value

An object of class Rec with the TAC recommendation.

Author(s)

Q. Huynh

References

Punt, A. E, Dorn, M. W., and Haltuch, M. A. 2008. Evaluation of threshold management strategies for groundfish off the U.S. West Coast. Fisheries Research 94:251-266.

Examples

# create an MP to run in closed-loop MSE (fishes at UMSY)
SPMSY <- make_MP(SP, HCR_MSY)

# The MP which fishes at 75% of FMSY
SP75MSY <- make_MP(SP, HCR_MSY, MSY_frac = 0.75)


myOM <- MSEtool::runMSE(MSEtool::testOM, MPs = c("FMSYref", "SPMSY", "SP75MSY"))

SAMtool documentation built on Nov. 18, 2023, 9:07 a.m.