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

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.

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.

Value

An object of class Rec with the TAC recommendation.

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.

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

Author

Q. Huynh

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)

# \donttest{
myOM <- MSEtool::runMSE(MSEtool::testOM, MPs = c("FMSYref", "SPMSY", "SP75MSY"))
#> ✔ Checking MPs
#> Error: Some MPs are not a functions of class `MP`: SPMSY, SP75MSY
# }