ypr_population: Population Parameters
In ypr: Yield Per Recruit

ypr_population

R Documentation

Population Parameters

Description

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 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.