get_F: Calculate F from harvest rate

In salmonMSE: Management Strategy Evaluation for Salmon Species

Calculate F from harvest rate

Description

Solves for apical instantaneous fishing mortality rate (F), proportional to fishing effort, from harvest rate (total retained catch over total abundance). The apical F can be greater than the realized F, if retention < 1. Used by AHA()

Usage

get_F(
  u = 0,
  K = 0,
  type = c("u", "catch"),
  M,
  N = 1,
  vul = 1,
  ret = 1,
  release_mort = 0,
  Fmax = 20
)

Arguments

u	Harvest rate, between 0-1
K	Catch, between 0-Inf
type	Character, either "catch", or "u", whether to solve for catch or harvest rate, respectively
M	Instantaneous natural mortality rate
N	Abundance
vul	Vulnerability
ret	Retention rate
release_mort	Release mortality as a proportion, between 0-1. Only relevant if ret < 1.
Fmax	Maximum allowable value of F

Value

Numeric for the apical F

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