Incremental Index Target MP - Effort-Based
ItargetE1.Rd
A management procedure that incrementally adjusts the fishing effort to reach a target CPUE / relative abundance index
Usage
ItargetE1(x, Data, reps = 100, plot = FALSE, yrsmth = 5, Imulti = 1.5)
ItargetE2(x, Data, reps = 100, plot = FALSE, yrsmth = 5, Imulti = 2)
ItargetE3(x, Data, reps = 100, plot = FALSE, yrsmth = 5, Imulti = 2.5)
ItargetE4(x, Data, reps = 100, plot = FALSE, yrsmth = 5, Imulti = 2.5)
Arguments
- 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.
Value
An object of class Rec-class
with the TAE slot(s) populated
Details
Four index/CPUE target MPs proposed by Geromont and Butterworth 2014.
The TAE is calculated as: If \(I_\textrm{recent} \geq I_0\): $$\textrm{TAE}_y = 0.5 \textrm{TAE}_{y-1} \left[1+ \left( \frac{I_{\textrm{recent}} - I_0}{I_{\textrm{target}} - I_0} \right)\right]$$
else: $$\textrm{TAE}_y= 0.5 \textrm{TAE}_{y-1} \left( \frac{I_{\textrm{recent}}}{I_0}^2 \right)$$
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 \(I_{\textrm{ave}}\).
Functions
ItargetE1
: The less precautionary TAE-based MPItargetE2
: Increasing biologically precautionary TAE-based MPItargetE3
: Increasing biologically precautionary TAE-based MPItargetE4
: The most biologically precautionary TAE-based MP
Rendered Equations
See Online Documentation for correctly rendered equations
References
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
Examples
ItargetE1(1, MSEtool::Atlantic_mackerel, plot=TRUE)
#> Effort
#> 0.85
ItargetE2(1, MSEtool::Atlantic_mackerel, plot=TRUE)
#> Effort
#> 0.85
ItargetE3(1, MSEtool::Atlantic_mackerel, plot=TRUE)
#> Effort
#> 0.85
ItargetE4(1, MSEtool::Atlantic_mackerel, plot=TRUE)
#> Effort
#> 0.85