`Itarget1_MPA.Rd`

A example mixed control MP that uses the Itarget1 output control MP together with a spatial closure.

Itarget1_MPA( x, Data, reps = 100, plot = FALSE, yrsmth = 5, xx = 0, Imulti = 1.5 )

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 |

xx | Parameter controlling the fraction of mean catch to start using in first year |

Imulti | Parameter controlling how much larger target CPUE / index is compared with recent levels. |

An object of class `Rec-class`

with the TAC, Spatial slot(s) populated

The TAC is calculated as: If \(I_\textrm{recent} \geq I_0\): $$\textrm{TAC}= 0.5 \textrm{TAC}^* \left[1+\left(\frac{I_\textrm{recent} - I_0}{I_\textrm{target} - I_0}\right)\right]$$

else: $$\textrm{TAC}= 0.5 \textrm{TAC}^* \left[\frac{I_\textrm{recent}}{I_0}^2\right]$$

where \(I_0\) is \(0.8 I_{\textrm{ave}}\) (the average index over the 2 x `yrsmth`

years prior to the projection period),
\(I_\textrm{recent}\) is the average index over the past `yrsmth`

years, and
\(I_\textrm{target}\) is `Imulti`

times \(I_{\textrm{ave}}\),
and \(\textrm{TAC}^*\) is:
$$(1-x)C$$
where \(x\) is argument `xx`

and C is the average catch over the last 5 years of the historical period.

This mixed control MP also closes Area 1 to fishing.

This MP has been included for demonstration purposes of a mixed control MP.

See `Data-class`

for information on the `Data`

object

`Itarget1_MPA`

: Cat, Ind, LHYear, Year

See Online Documentation for correctly rendered equations

Other Index methods:
`GB_slope()`

,
`GB_target()`

,
`Gcontrol()`

,
`ICI()`

,
`Iratio()`

,
`Islope1()`

,
`Itarget1()`

,
`ItargetE1()`

#> TAC (median) Area 1 Area 2 #> 7.097259 0.000000 1.000000