calc_yearling: Calculate hatchery releases

In salmonMSE: Management Strategy Evaluation for Salmon Species

Calculate hatchery releases

Description

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

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

Usage

calc_yearling(egg_target, s_yearling, s_subyearling, p_yearling, p_subyearling)

.yearling_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
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_yearling() returns a named list returned by .yearling_func()

.yearling_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

salmonMSE documentation built on Aug. 20, 2026, 5:09 p.m.