Itarget1_MPA {DLMtool} | R Documentation |
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. |
The TAC is calculated as: If I_\textrm{recent} ≥q I_0:
\textrm{TAC}= 0.5 \textrm{TAC}^* ≤ft[1+≤ft(\frac{I_\textrm{recent} - I_0}{I_\textrm{target} - I_0}\right)\right]
else:
\textrm{TAC}= 0.5 \textrm{TAC}^* ≤ft[\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.
An object of class Rec-class
with the TAC, Spatial slot(s) populated
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()
Itarget1_MPA(1, MSEtool::Atlantic_mackerel, plot=TRUE)