Calcu_SPR_X: Calculate F%SPR: the fishing mortality that reduces the...

In ShotaNishijima/frasam: Fisheries Research Agency (FRA) provides an R package for analyzing the State-space Assessment Model (SAM)

Calculate F%SPR: the fishing mortality that reduces the spawning biomass per recruit (SBR) to X % of those without fishing (SPR0).

Description

Calcu_SPR_X calculates F%SPR (the fishing mortality that reduce the spawning biomass per recruit (SBR) to X % of those without fishing (SPR0)).

Usage

Calcu_SPR_X(x, M, Sel, w, g, A = 6, F_max = 2)

Arguments

x	The proportion (X) to calculate F% SPR. This parameter should be provided as a proportion (i.e. within the range from 0 to 1). Defalut is 0.2.
M	A vector of natural mortality rate at age a. The length should be A+1.
Sel	A vector of selectivity at age a. The length should be A+1.
w	A vector of weight at age a. The length should be A+1.
g	A vector of maturity at age a. The length should be A+1.
A	Plus group age. Default is 6.
F_max	This value should be large enough so that the true F%SPR value be included (otherwise a warning message appears). Defalut is 1.

Value

A value of F% SPR.

ShotaNishijima/frasam documentation built on Sept. 9, 2024, 8:43 p.m.