Description Usage Arguments Author(s)

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

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`lnq` |
number: estimate of log catchability |

`N` |
marix maxage by nareas with initial numbers at age |

`Asize_c` |
vector length nareas with size of each area |

`SSBMSYc` |
number: spawning biomass at MSY |

`SSBpRc` |
vector length nareas with SSBpR by area |

`MPA` |
matrix of spatial closures |

`SSB0c` |
SSB0 |

`nareas` |
numeric: number of areas |

`retAc` |
matrix maxage by nyears+proyears of retention by age and year |

`MGThorizonc` |
number: MGT x HZN |

`Fc` |
vector nyears long of fishing mortality rate |

`Perrc` |
vector nyears+maxage-1 long of recruitment devitions |

`Mc` |
matrix maxage by nyears+proyears of natural mortality rate |

`hc` |
number: steepness values |

`Mac` |
matrix nages by nyears+proyears of maturity at age |

`Wac` |
vector nages long of weight at age |

`R0c` |
number: unfished recruitment |

`Vc` |
matrix of vulnerability maxage x nyears |

`nyears` |
integer: number of historical years |

`maxage` |
integer: maximum age |

`movc` |
matrix of movement 2 x 2 |

`Spat_targc` |
number: spatial targetting parameters |

`SRrelc` |
integer representing recruitmetn dynamics type 1: Bev Holt 2: Ricker |

`aRc` |
number: recruitment parameter |

`bRc` |
number: recruitment parameter |

`Bfrac` |
fraction of SSBMSY that is the target |

`maxF` |
maximum apical fishing mortality |

`mode` |
1: find Blow 2:report blow 3:plot results |

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

T. Carruthers with modifications by A. Hordyk

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