HCR_MSY {SAMtool}

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.

See Also

make_MP HCR_ramp

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"))