f_values: Compute various fishing mortality reference point

In inspktrgadget/gadgetSim: Create Gadget replicates for use in simulation studies

Description

These functions will compute a variety of reference points relating to fishing mortality. Various parameters about the stock must be entered as these use yield-per-recruit analysis to determing the reference points.

Usage

f_msy(fish_mort, nat_mort, ages, growth_fun = vb, growth_params = NULL,
  lw_rel = lw, lw_params = NULL, rec_fun = bev_holt, rec_params = NULL,
  mat_fun = logistic_selectivity, mat_params = NULL,
  sel_fun = logistic_selectivity, sel_params = NULL, ...)

f_crash(fish_mort, nat_mort, ages, growth_fun = vb, growth_params = NULL,
  rec_fun = bev_holt, rec_params = NULL, lw_rel = lw, lw_params = NULL,
  mat_fun = logistic_selectivity, mat_params = NULL,
  sel_fun = logistic_selectivity, sel_params = NULL)

f_0.1(fish_mort, nat_mort, ages, growth_fun = vb, growth_params = NULL,
  lw_rel = lw, lw_params = NULL, sel_fun = logistic_selectivity,
  sel_params = NULL)

f_lim(fish_mort, limit, nat_mort, ages, growth_fun = vb,
  growth_params = NULL, lw_rel = lw, lw_params = NULL,
  rec_fun = bev_holt, rec_params = NULL, mat_fun = logistic_selectivity,
  mat_params = NULL, sel_fun = logistic_selectivity, sel_params = NULL,
  ...)

Arguments

fish_mort	Numeric. A vector depicting fishing mortality
nat_mort	Numeric. A vector of either length 1 or the same length as ages
ages	Numeric vector representing ages
growth_fun	The name of the growth function to be used
growth_params	List of named elements corresponding to arguments to growth_fun
lw_rel	Function name determining the length-weight relationship
lw_params	List of named elements corresponding to arguments to lw_rel
sel_fun	Function determining the length-based selectivity of the fleet
sel_params	List of named elements corresponding to arguments to sel_fun
...

Details

f_msy will determine the fishing mortality that produces maximum sustained yield, f_crash returns the fishing mortality that will make the stock go extinct (i.e. crash the stock), f_0.1 produces the fishing mortality that is roughly 1/10th of the slope at the origin of the yield-per-recruit curve. f_lim will find both of the fishing mortalities to which F_{msy} is scaled by limit

Value

A numeric vector of length 1, except for f_lim, which returns 2 values

Examples

f_msy(fish_mort = seq(0, 2, 0.01), nat_mort = 0.2, ages = 0:20,
      growth_fun = vb,
      growth_params = list(linf = 125, k = 0.15, t0 = -0.5),
      lw_rel = lw, lw_params = list(alpha = 7e-06, beta = 3.1),
      rec_fun = bev_holt,
      rec_params = list(mu = 4e8, lambda = 1.7e08),
      mat_fun = logistic_selectivity,
      mat_params = list(alpha = 0.25, l50 = 30),
      sel_fun = logistic_selectivity,
      sel_params = list(alpha = 0.25, l50 = 40))

inspktrgadget/gadgetSim documentation built on May 10, 2019, 9:51 a.m.