salmonMSE (version 0.1.0)

get_F: 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.

Usage

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

Value

Numeric for the apical F

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