Description Usage Arguments Details Value Functions Required Data Rendered Equations Author(s) References See Also Examples
A management procedure that incrementally adjusts the fishing effort to reach a target CPUE / relative abundance index
1 2 3 4 5 6 7 |
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 the average index is calculated. |
Imulti |
Parameter controlling how much larger target CPUE / index is compared with recent levels. |
Four index/CPUE target MPs proposed by Geromont and Butterworth 2014.
The TAE is calculated as: If I_\textrm{recent} ≥q I_0:
\textrm{TAE}_y = 0.5 \textrm{TAE}_{y-1} ≤ft[1+ ≤ft( \frac{I_{\textrm{recent}} - I_0}{I_{\textrm{target}} - I_0} \right)\right]
else:
\textrm{TAE}_y= 0.5 \textrm{TAE}_{y-1} ≤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}}.
An object of class Rec
with the TAE slot(s) populated
ItargetE1
: The less precautionary TAE-based MP
ItargetE2
: Increasing biologically precautionary TAE-based MP
ItargetE3
: Increasing biologically precautionary TAE-based MP
ItargetE4
: The most biologically precautionary TAE-based MP
See Data for information on the Data
object
ItargetE1
: Ind, LHYear, MPeff, Year
See Online Documentation for correctly rendered equations
T. Carruthers
Carruthers et al. 2015. Performance evaluation of simple management procedures. ICES J. Mar Sci. 73, 464-482.
Geromont, H.F., Butterworth, D.S. 2014. Generic management procedures for data-poor fisheries; forecasting with few data. ICES J. Mar. Sci. 72, 251-261. doi:10.1093/icesjms/fst232
Other Index methods:
GB_slope()
,
GB_target()
,
Gcontrol()
,
ICI()
,
Iratio()
,
Islope1()
,
Itarget1_MPA()
,
Itarget1()
1 2 3 4 | ItargetE1(1, DLMtool::Atlantic_mackerel, plot=TRUE)
ItargetE2(1, DLMtool::Atlantic_mackerel, plot=TRUE)
ItargetE3(1, DLMtool::Atlantic_mackerel, plot=TRUE)
ItargetE4(1, DLMtool::Atlantic_mackerel, plot=TRUE)
|
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