optistock (version 0.0.2)

cost_per_fish: Compute the per-cost fish based on stocking time, time to recruitment, growth, and mortality

Description

Compute the per-cost fish based on stocking time, time to recruitment, growth, and mortality

Usage

cost_per_fish(
  time_at_stocking,
  time_at_rec,
  n_recruits_desired,
  cost_fun = total_cost,
  cost_fun_args,
  mort_fun = constant_mort,
  mort_fun_args
)

Value

The per-fish cost fish that lives until time_at_rec based on time_at_stocking, the cost function and mortality functions.

Arguments

time_at_stocking

The time at which fish are stocked (i.e. synonymous with the amount of time that fish are raised in a hatchery)

time_at_rec

The time at which a fish enters the fishery (i.e. the amount of time it takes a fish to grow to a desired length). Use inv_vb to calculate this.

n_recruits_desired

The number of recruits desired at time_at_rec

cost_fun

The cost function. Defaults to total_cost

cost_fun_args

Arguments for cost_fun

mort_fun

The mortality function, see ?mort_funs

mort_fun_args

List. Named arguments to be passed to mort_fun

Examples

cost_args <- list(
    init_cost = 0.05,
    time_slope = 0.01, time_exp = 1.2,
    rec_exp = 1
)
mort_args <- list(m_init = (1 / 365))
# the cost-per-fish to stock across a range of times given cost and mortality
# assumes fish recruit into the fishery at day 1000
curve(cost_per_fish(
    x, 1000, 1000,
    cost_fun_args = cost_args,
    mort_fun_args = mort_args),
  xlab = "Days", ylab = "$ per fish stocked",
  10, 1200
)