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Find the current biomass at which it would take HZN mean generation times to reach Bfrac x SSBMSY biomass level given zero catches

Usage

getBlow(
  x,
  N,
  Asize,
  SSBMSY,
  SSBpR,
  MPA,
  SSB0,
  nareas,
  retA,
  MGThorizon,
  Find,
  Perr,
  M_ageArray,
  hs,
  Mat_age,
  Wt_age,
  Fec_age,
  R0a,
  V,
  nyears,
  maxage,
  mov,
  Spat_targ,
  SRrel,
  aR,
  bR,
  Bfrac = 0.5,
  maxF,
  ploty = F,
  plusgroup = 0,
  SRRfun,
  SRRpars,
  spawn_time_frac
)

Arguments

x

position in a vector

N

array of numbers at age by sim and area (dims nsim, maxage, nyears, nareas)

Asize

matrix of area size (nsim by nareas)

SSBMSY

vector nsim long of spawning biomass at MSY

SSBpR

matrix nsim by nareas with SSB per recruit

MPA

matrix nyears + proyears by nareas of spatial closures

SSB0

vector of SSB0 length nsim

nareas

numeric. number of areas

retA

array of retention nsim x maxage x nyears

MGThorizon

vector nsim long of MGT x HZN

Find

matrix of fishing mortality rate nsim x nyears

Perr

matrix of recruitment deviations nsim x nyears + maxage -1

M_ageArray

array of natural mortality rate nsim x maxage x nyears + proyears

hs

vector nsim long of steepness values

Mat_age

array nsim x nages x nyears+proyears of maturity at age

Wt_age

matrix nsim x nages of weight at age

R0a

matrix nsim by nareas of unfished recruitment

V

array of vulnerability nsim x maxage x nyears

nyears

integer: number of historical years

maxage

integer: maximum age

mov

array of movement nsim x 2 x 2

Spat_targ

vector of spatial targeting parameters

SRrel

integer representing recruitment dynamics type 1: Bev Holt 2: Ricker

aR

vector of recruitment parameters

bR

vector of recruitment parameters

Bfrac

fraction of SSBMSY that is the target

maxF

maximum apical fishing mortality

ploty

logical: should a plot be produced

plusgroup

Integer. Default = 0 = no plus-group. Use 1 to include a plus-group

spawn_time_frac

Numeric. Fraction of the year when spawning occurs. Default = 0.

Author

T. Carruthers with modifications by A. Hordyk