Generates an object of class `ypr_population`

.

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 )

tmax | The maximum age (yr). |
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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. |

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 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. |

An object of class `ypr_population`

.

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