Description Usage Arguments Details Value Functions Required Data Rendered Equations Author(s) References See Also Examples
A management procedure that incrementally adjusts the TAE to reach a target mean length in catches.
1 2 3 |
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 calculate mean length |
xL |
Parameter controlling the magnitude of the target mean length of catches relative to average length in catches. |
Four target length MPs proposed by Geromont and Butterworth 2014. Tested by Carruthers et al. 2015.
The TAE is calculated as:
If L_\textrm{recent} ≥q L_0:
\textrm{TAE} = 0.5 \textrm{TAE}^* ≤ft[1+≤ft(\frac{L_\textrm{recent}-L_0}{L_\textrm{target}-L_0}\right)\right]
else:
\textrm{TAE} = 0.5 \textrm{TAE}^* ≤ft[\frac{L_\textrm{recent}}{L_0}^2\right]
where \textrm{TAE}^* is the effort in the previous year,
L_\textrm{recent} is mean length in last yrmsth
years, L_0 is (except for L95target
) 0.9 average catch in the last
2 x yrsmth
historical (pre-projection years) (L_\textrm{ave}), and L_\textrm{target} is
(except for L95target
) xL
L_\textrm{ave}.
An object of class Rec
with the TAE slot(s) populated
LtargetE1
: The least biologically precautionary TAE-based MP.
LtargetE4
: The xL
argument is increased to 1.15.
See Data for information on the Data
object
LtargetE1
: LHYear, ML, 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. doi:10.1093/icesjms/fst232
Other Length target MPs:
Lratio_BHI()
,
Ltarget1()
1 2 | LtargetE1(1, Data=DLMtool::SimulatedData, plot=TRUE)
LtargetE4(1, Data=DLMtool::SimulatedData, plot=TRUE)
|
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