Length_VB: Von Bertalanffy Growth Model (Length)

In IMPRESSPROJECT/ModelingPopulation: Modeling of an exploited population (structured by age)

Description

Computes the length using Von Bertalanffy Growth Model.

Usage

Length_VB(L_inf, k, ages, t0)

Arguments

L_inf	Asymptotic average maximum body size.
k	Growth rate coefficient that determines how quickly the maximum is attained.
ages	Vector of ages.
t0	Hypothetical age at which the species has zero length.

Details

The function implements Von Bertalanffy Growth Model which equation is

L(x)=L_inf*(1-exp(-k*(x-t0)))

where L_inf is the asymptotic average maximum body size, t0 is hypothetical age at which the species has zero length, and k is growth rate coefficient and x is the vector of ages where the function must be computed. Note if you want the length at some time of the year you only need to sum the corresponding value t to the ages before to introduce them into the function. For example, in order to obtain the length at March you need to introduce ages+t where t=0.3. The year is a unit and hence t is between 0 and 1.

Value

L: Vector containing the length for each age.

Author(s)

• Marta Cousido-Rocha

• Santiago Cerviño López

IMPRESSPROJECT/ModelingPopulation documentation built on March 21, 2020, 12:14 a.m.