Generates an object of class `ypr_population`

.

## Usage

```
ypr_population(
tmax = 20L,
k = 0.15,
Linf = 100,
t0 = 0,
k2 = 0.15,
Linf2 = 100,
L2 = 1000,
Wb = 3,
Ls = 50,
Sp = 100,
es = 1,
Sm = 0,
fb = 1,
tR = 1L,
BH = 1L,
Rk = 3,
n = 0.2,
nL = 0.2,
Ln = 1000,
Lv = 50,
Vp = 100,
Llo = 0,
Lup = 1000,
Nc = 0,
pi = 0.2,
rho = 0,
Hm = 0,
Rmax = 1,
Wa = 0.01,
fa = 1,
q = 0.1,
RPR = 1
)
```

## Arguments

- tmax
The maximum age (yr).

- k
The VB growth coefficient (yr-1).

- Linf
The VB mean maximum length (cm).

- t0
The (theoretical) age at zero length (yr).

- k2
The VB growth coefficient after length L2 (yr-1).

- Linf2
The VB mean maximum length after length L2 (cm).

- L2
The length (or age if negative) at which growth switches from the first to second phase (cm or yr).

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

- Ls
The length (or age if negative) at which 50 % mature (cm or yr).

- 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 (or the egg to tR survival if between 0 and 1).

- n
The

**annual interval**natural mortality rate from age tR.- nL
The

**annual interval**natural mortality rate from length Ln.- Ln
The length (or age if negative) at which the annual interval natural mortality rate switches from n to nL (cm or yr).

- Lv
The length (or age if negative) at which 50 % vulnerable to harvest (cm or yr).

- 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).

- 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.

- RPR
The relative proportion of recruits that are of the ecotype.

## Examples

```
ypr_population(k = 0.1, Linf = 90)
#> tmax: 20
#> k: 0.1
#> Linf: 90
#> t0: 0
#> k2: 0.15
#> Linf2: 100
#> L2: 1000
#> Wb: 3
#> Ls: 50
#> Sp: 100
#> es: 1
#> Sm: 0
#> fb: 1
#> tR: 1
#> BH: 1
#> Rk: 3
#> n: 0.2
#> nL: 0.2
#> Ln: 1000
#> Lv: 50
#> Vp: 100
#> Llo: 0
#> Lup: 1000
#> Nc: 0
#> pi: 0.2
#> rho: 0
#> Hm: 0
#> Rmax: 1
#> Wa: 0.01
#> fa: 1
#> q: 0.1
#> RPR: 1
```