Lratio_BHI {DLMtool} | R Documentation |
The TAC is calculated as the most recent catch, modified by the ratio alpha, where the numerator is the mean length of the catch (of lengths larger than Lc) and the denominator is the mean length expected at MSY. Here, Lc is the length at full selection (LFS).
Lratio_BHI(x, Data, reps = 100, plot = FALSE, yrsmth = 3) Lratio_BHI2(x, Data, reps = 100, plot = FALSE, yrsmth = 3) Lratio_BHI3(x, Data, reps = 100, plot = FALSE, yrsmth = 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 |
The most recent years of data to smooth the calculation of the mean length |
The TAC is calculated as:
\textrm{TAC}_y = C_{y-1} \frac{L}{L_\textrm{ref}}
where C_{y-1} is the catch from the previous year, L is the mean
length of the catch over the last yrsmth
years (of lengths larger than Lc) and L_\textrm{ref} is the
mean length expected at MSY. Here, Lc is the length at full selection (LFS).
An object of class Rec-class
with the TAC
slot populated with a numeric vector of length reps
Lratio_BHI
: Assumes M/K = 1.5 and FMSY/M = 1. Natural mortality M and von Bertalanffy
K are not used in this MP (see Appendix A of Jardim et al. 2015).
Lratio_BHI2
: More general version that calculates the reference mean length as a
function of M, K, and presumed FMSY/M.
Lratio_BHI3
: A modified version of Lratio_BHI2 where mean length
is calculated for lengths > modal length (Lc)
See Data-class
for information on the Data
object
Lratio_BHI
: CAL, CAL_bins, Cat, LFS, vbLinf
Lratio_BHI2
: CAL, CAL_bins, Cat, FMSY_M, LFS, Mort, vbK, vbLinf
Lratio_BHI3
: CAL, CAL_bins, Cat, FMSY_M, LFS, Mort, vbK, vbLinf
See Online Documentation for correctly rendered equations
Coded by Q. Huynh. Developed by Jardim et al. (2015)
Ernesto Jardim, Manuela Azevedo, Nuno M. Brites, Harvest control rules for data limited stocks using length-based reference points and survey biomass indices, Fisheries Research, Volume 171, November 2015, Pages 12-19, ISSN 0165-7836, https://doi.org/10.1016/j.fishres.2014.11.013
Other Length target MPs:
Ltarget1()
,
LtargetE1()
Lratio_BHI(1, Data=MSEtool::SimulatedData, plot=TRUE) Lratio_BHI2(1, Data=MSEtool::SimulatedData, plot=TRUE) Lratio_BHI3(1, Data=MSEtool::SimulatedData, plot=TRUE)