Description Usage Arguments Details Value Required Data Rendered Equations Author(s) References See Also Examples

A management procedure that makes incremental adjustments to TAC recommendations based on the apparent trend in recent surplus production. Based on the theory of Mark Maunder (IATTC)

1 2 |

`x` |
A position in the data object |

`Data` |
A data object |

`reps` |
The number of stochastic samples of the MP recommendation(s) |

`plot` |
Logical. Show the plot? |

`yrsmth` |
Years over which to smooth recent estimates of surplus production |

`alp` |
Condition for modifying the Data (bounds on change in abundance) |

`bet` |
Limits for how much the Data can change among years |

Note that this isn't exactly what Mark has previously suggested and is stochastic in this implementation.

The TAC is calculated as:

where *r* is the ratio of predicted biomass in next year to biomass in
current year *\bar{C}* is the mean catch over the last `yrmsth`

years, *α_1*
and *α_2* are specified in `alp`

, *\textrm{bet}_1* and *\textrm{bet}_2*
are specified in `bet`

, *\textrm{SP}* is estimated surplus production in most recent year,
and:

*M = 1-\textrm{bet}_1 \frac{B_y - \tilde{B}_y}{B_y}*

where *B_y* is the most recent estimate of biomass and *\tilde{B}*
is the predicted biomass in the next year.

An object of class `Rec`

with the `TAC`

slot populated with a numeric vector of length `reps`

See Data for information on the `Data`

object

`SPslope`

: Abun, Cat, Ind, Year

See Online Documentation for correctly rendered equations

T. Carruthers

http://www.iattc.org/Meetings/Meetings2014/MAYSAC/PDFs/SAC-05-10b-Management-Strategy-Evaluation.pdf

Other Surplus production MPs: `Fadapt`

,
`Rcontrol`

, `SPMSY`

,
`SPSRA`

, `SPmod`

1 | ```
SPslope(1, Data=DLMtool::Atlantic_mackerel, plot=TRUE)
``` |

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