A simple control rule that allows fishing when the operational control point (OCP) is above some threshold. By default, this function sets the TAC at F = 100% FMSY when spawning depletion > 0.1.
Usage
HCR_escapement(
Assessment,
reps = 1,
OCP_type = "SSB_SSB0",
OCP_threshold = 0.2,
Ftarget_type = "FMSY",
relF_max = 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.
- OCP_type
The type of operational control points (OCPs) for the harvest control rule used to determine whether there is fishing. By default, use (
"SSB_SSB0"for spawning depletion. Other biomass OCPs include"SSB_SSBMSY"for spawning biomass relative to MSY and"SSB_dSSB0", for dynamic depletion (dynamic SSB0 is the historical reconstructed biomass with F = 0). For F-based OCPs, the terminal year fishing mortality relative F01 or Fmax (using yield-per-recruit) or F-SPR% (seeSPR_OCPargument) can be used.- OCP_threshold
The value of the OCP above which fishing can occur.
- Ftarget_type
The type of F used for the target fishing mortality rate.
- relF_max
The relative value of Ftarget if
OCP > OCP_treshold.- ...
Miscellaneous arguments.
Value
An object of class MSEtool::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
Deroba, J.J. and Bence, J.R. 2008. A review of harvest policies: Understanding relative performance of control rules. Fisheries Research 94:210-223.
Examples
# create an MP to run in closed-loop MSE (fishes at FMSY when B/B0 > 0.2)
SP_escapement <- make_MP(SP, HCR_escapement)
# The MP which fishes at 75% of FMSY
SP_escapement75 <- make_MP(SP, HCR_escapement, relF_max = 0.75)
# The MP which fishes at FMSY when BMSY > 0.5
SP_BMSY_escapement <- make_MP(SP, HCR_escapement, OCP_type = "SSB_SSBMSY",
OCP_threshold = 0.5, relF_max = 1)
# \donttest{
myOM <- MSEtool::runMSE(MSEtool::testOM, MPs = c("FMSYref", "SP_escapement", "SP_BMSY_escapement"))
#> ℹ Checking OM for completeness
#> ✔ Loading operating model
#> ✔ Optimizing for user-specified movement
#> ✔ Calculating MSY reference points for each year
#> ✔ Optimizing for user-specified depletion in last historical year
#> ✔ Calculating historical stock and fishing dynamics
#> ✔ Calculating per-recruit reference points
#> ✔ Calculating B-low reference points
#> ✔ Calculating reference yield - best fixed F strategy
#> ✔ Simulating observed data
#> ✔ Running forward projections
#> ✔ 1 / 3 Running MSE for FMSYref
#>
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#>
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#>
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#>
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#>
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#>
# }