ices.hcr: The typical HCR used by ICES

In flr/mse: Tools for Running Management Strategy Evaluations using FLR

The typical HCR used by ICES

Description

The typical HCR used by ICES which sets a target F based on the SSB based on 4 parameters: sblim, sbsafe, fmin and ftrg. F increases linearly between SSB = blim and SSB = bsafe, from F = fmin to F = ftrg. If:

• B < Blim, F = Fbycatch;

• B > trigger, F = Fmsy;

• B > Blim & B < trigger, F linear between Fbycatch and Fmsy;

• F = ftrg is the maximum F, F = fmin is the minimum F. F is set in year ay, based on SSB in year ay - data_lag

Usage

ices.hcr(
  stk,
  ftrg,
  sblim,
  sbsafe,
  fmin = 0,
  minfbar = range(stk, "minfbar"),
  maxfbar = range(stk, "maxfbar"),
  args,
  tracking
)

Arguments

stk	The perceived FLStock.
ftrg	TODO:description
sblim	TODO:description
sbsafe	TODO:description
fmin	Minimum fishing mortality.
args	MSE arguments, class list.
tracking	Structure for tracking modules outputs.

Value

A list with elements ctrl, of class fwdControl, and tracking.

Examples

data(ple4)
# Test for year when SSB > bsafe
ices.hcr(ple4, fmin=0.05, ftrg=0.15, sblim=200000, sbsafe=300000,
  args=list(ay=2018, data_lag=1, management_lag=1), tracking=FLQuant())
# Test for year when SSB < bsafe
ices.hcr(ple4, fmin=0.05, ftrg=0.15, sblim=200000, sbsafe=300000,
  args=list(ay=1995, data_lag=1, management_lag=1), tracking=FLQuant())

flr/mse documentation built on Dec. 18, 2024, 10:38 p.m.