Generates an object of class ypr_population.

ypr_population(tmax = 20L, k = 0.15, Linf = 100, t0 = 0, Wb = 3,
  Ls = Linf/2, Sp = 100, es = 1, Sm = 0, fb = 1, tR = 1L,
  BH = 1L, Rk = 3, M = 0.2, Mb = 0, Lv = Linf/2, Vp = 100,
  Llo = 0, Lup = Linf, Nc = 0, pi = 0.2, rho = 0, Hm = 0,
  Rmax = 1, A0 = 0, Wa = 0.01, fa = 1, q = 0.1)

Arguments

tmax

The maximum age (yr).

k

The VB growth coefficient (per yr).

Linf

The VB mean maximum length (cm).

t0

The (theoretical) age at zero length (yr).

Wb

The weight (as a function of length) scaling exponent.

Ls

The length at which 50% mature (cm).

Sp

The maturity (as a function of length) power.

es

The annual probability of a mature fish spawning.

Sm

The spawning mortality probability.

fb

The fecundity (as a function of weight) scaling exponent.

tR

The age from which survival is density-independent (yr).

BH

Recruitment follows a Beverton-Holt (1) or Ricker (0) relationship.

Rk

The lifetime spawners per spawner at low density.

M

The instantaneous mortality rate (per yr).

Mb

The instantaneous mortality rate (as a function of length) scaling exponent.

Lv

The length at which 50% vulnerable to harvest (cm).

Vp

The vulnerability to harvest (as a function of length) power.

Llo

The lower harvest slot length (cm).

Lup

The upper harvest slot length (cm).

Nc

The slot limits non-compliance probability.

pi

The annual capture probability.

rho

The release probability.

Hm

The hooking mortality probability.

Rmax

The number of recruits at the carrying capacity (ind).

A0

The initial post age tR density independent mortality probability.

Wa

The (extrapolated) weight of a 1 cm individual (g).

fa

The (theoretical) fecundity of a 1 g female (eggs).

q

The catchability (annual probability of capture) for a unit of effort.

Value

An object of class ypr_population.

See also

Examples

ypr_population(k = 0.1, Linf = 90)
#> tmax: 20 #> k: 0.1 #> Linf: 90 #> t0: 0 #> Wb: 3 #> Ls: 45 #> Sp: 100 #> es: 1 #> Sm: 0 #> fb: 1 #> tR: 1 #> BH: 1 #> Rk: 3 #> M: 0.2 #> Mb: 0 #> Lv: 45 #> Vp: 100 #> Llo: 0 #> Lup: 90 #> Nc: 0 #> pi: 0.2 #> rho: 0 #> Hm: 0 #> Rmax: 1 #> A0: 0 #> Wa: 0.01 #> fa: 1 #> q: 0.1