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Calculate hatchery releases

Source: R/hatchery.R
calc_release.Rd

From egg target, calculate production of yearlings and subyearlings conditional on survival and proportion of releases.

.release_func() is the optimization function that determines proportions.

Usage

calc_release(
  egg_target,
  s_yearling,
  s_subyearling,
  p_yearling,
  p_subyearling,
  n_r = 1
)

.release_func(
  p_egg_yearling,
  egg_target,
  s_yearling,
  s_subyearling,
  p_yearling,
  opt = TRUE
)

Arguments

egg_target

Numeric

s_yearling

Numeric, survival from egg to yearling

s_subyearling

Numeric, survival from egg to subyearling

p_yearling

Vector [n_r], proportion of releases at subyearling stage, where sum(p_yearling, p_subyearling) = 1

n_r

Integer, the number of release strategies. Used to validate the output

p_egg_yearling

Numeric, proportion to eggs to become yearlings

opt

Logical, whether the function is used for optimization (TRUE) or reporting (FALSE)

Value

calc_release() returns a named list returned by .release_func()

.release_func() returns a numeric if opt = TRUE: yearling/(yearling + subyearling) - p_yearling. Otherwise, log(p_unmarked) - log(ptarget_NOB)`, otherwise a named list:

  • yearling Vector [n_r] of yearling releases

  • subyearling Vector [n_r] of subyearling releases