
Effort Target Optimum Length
EtargetLopt.Rd
This MP adjusts effort limit based on the ratio of recent mean length (over
last yrsmth
years) and a target length defined as Lopt.
Effort MP: adjust effort up/down if mean length above/below Ltarget
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
Number of years to calculate average length
- buffer
Parameter controlling the fraction of calculated effor - acts as a precautionary buffer
Value
An object of class Rec-class
with the TAE slot(s) populated
Details
The TAE is calculated as:
TAEy=TAEy−1((1−buffer)(w+(1−w)r))
where buffer is specified in argument buffer
, w is fixed at 0.5, and:
r=LrecentLopt
where Lrecentis mean
length over last yrmsth
years, and:
Lopt=L∞WbMK+Wb
where L∞ is von Bertalanffy asymptotic length, Wb is
exponent of the length-weight relationship, M is natural mortality, and
K is von Bertalanffy growth coefficient.#'
Required Data
See Data-class
for information on the Data
object
EtargetLopt
: ML, MPeff, Mort, Year, vbK, vbLinf, wlb
Rendered Equations
See Online Documentation for correctly rendered equations
Examples
EtargetLopt(1, MSEtool::SimulatedData, plot=TRUE)
#> Effort
#> 0.8003528