Effort_solver: Solve for fishing effort

In salmonMSE: Management Strategy Evaluation for Salmon Species

Solve for fishing effort

Description

Internal solver used by catch_func() to calculate the fishing effort needed to achieve target harvest rate or catch rate, subject to partial retention due to mark-selective fishing. Harvest rate is discounted by adult equivalents for preterminal fisheries.

Usage

Effort_solver(
  Eff,
  N,
  vul,
  ret,
  release_mort,
  type = c("u", "catch"),
  u = 0,
  K = 0,
  AEQ = array(1, dim(N)),
  p_mature = array(1, dim(N))
)

Arguments

Eff	Numeric, fishing effort
N	Array ⁠[ns, nage, n_r]⁠, total abundance (juvenile abundance for preterminal, return for terminal)
vul	Array ⁠[ns, nage, n_r]⁠, fishery vulnerability
ret	Vector ⁠[ns]⁠, retention rate
release_mort	Vector ⁠[ns]⁠, release mortality as a proportion, between 0-1. Only relevant if ret < 1.
type	Character, either "catch", or "u", whether to solve for kept catch or harvest rate, respectively
u	Numeric, harvest rate target
K	Numeric, kept catch target
AEQ	Array ⁠[ns, nage, n_r]⁠, adult equivalents of catch
p_mature	Array ⁠[ns, nage, n_r]⁠, proportion mature by age class (used to calculate adult equivalent escapement)

Value

Numeric. Returns the difference between the realized harvest rate (for the given value of Eff) and the target

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