Calculates optimum trophy catch given a slot size over a range of F values. Also, finds Fmax for a cohort given age-at-first recruitment, age-at-first-entry, slot age, and age at which fish are considered trophy size following Jensen (1981).

1 2 |

`M` |
natural mortality |

`N` |
cohort size |

`recage` |
age-at-first recruitment |

`entage` |
age-at-entry into the fishery |

`slage` |
upper age of slot for legal fish |

`trage` |
age of fish considered trophy size |

`stF` |
starting F of range to explore |

`endF` |
ending F of range to explore |

`intF` |
increment of F |

Calculations follow equations given in Jensen (1981).

`Catch` |
dataframe containing range of Fs and associated total catch, nontrophy, and trophy catch of designated cohort size |

`Fmax ` |
F at which trophy catch is maximum given slot |

Gary A. Nelson, Massachusetts Division of Marine Fisheries gary.nelson@state.ma.us

Jense, A. L. 1981. Optimum size limits for trout fisheries. Can. J. Fish. Aquat. Sci. 38: 657-661.

`opt_trophy`

1 2 | ```
# Example from Jensen (1981) page 661
opt_slot(M=0.70,N=1000,recage=1,entage=1,slage=3,trage=4)
``` |

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