Applies the harvest control rule (HCR) decision to scale the target catch or fishing mortality based on a reference quantity (status-quo fishing mortality or catch).
Usage
indicator.is(stk, ctrl, args, tracking, system = c("output", "input"), ...)Arguments
- stk
The perceived FLStock object returned by the OEM module.
- ctrl
The fwdControl object output by the hcr step, containing the HCR decision.
- args
The MSE run arguments, including
sqy(status-quo years).- tracking
The tracking object for recording module decisions and outputs.
- system
Character, either "output" (default) or "input". If "output", catch is used as reference; if "input", fishing mortality is used.
- ...
Additional arguments (currently unused).
Value
A list containing:
- ctrl
The modified fwdControl with scaled target values.
- tracking
The updated tracking object.
Details
This implementation system (IS) function adjusts the management decision from the HCR step by multiplying it with a reference quantity computed from the stock-at-age data in the perceived stock, allowing for indicator-based management approaches. The reference quantity can be either the status-quo fishing mortality (input system) or catch (output system).
When system="output", the function scales the HCR target by the mean catch from the
status-quo years. When system="input", it scales by the mean fishing mortality.
This approach allows MPs to work with relative rather than absolute targets.
See also
tac.is, sp.is, seasonal.is
Examples
data(plesim)
# Setup control with indicator.is using output system (catch-based)
control <- mpCtrl(list(est=mseCtrl(method=perfect.sa),
hcr=mseCtrl(method=hockeystick.hcr,
args=list(lim=0, trigger=0.5, target=1.2)),
isys=mseCtrl(method=indicator.is, args=list(system="output"))))
# Run MP
run <- mp(om, oem, control=control, args=list(iy=2021, fy=2027))
#> 2021 - 2022 - 2023 - 2024 -
#> Warning: Selected elements do not form a coherent 6D array
#> 2025 -
#> Warning: Selected elements do not form a coherent 6D array
#> 2026 -
#> Warning: Selected elements do not form a coherent 6D array
#>