Ltarget4:
A management procedure that incrementally adjusts the TAC to reach a target mean length in catches.
Description
The most biologically precautionary of four target length MPs proposed by Geromont and Butterworth 2014. Tested by Carruthers et al. 2015
Usage
Ltarget4(x, DLM_data, reps = 100, yrsmth = 5, xx=0.2, xL=1.15)
Arguments
x
A position in data-limited methods data object
DLM_data
A data-limited methods data object
reps
The number of TAC samples
yrsmth
Years over which to smooth recent estimates of surplus production
xx
Parameter controlling the fraction of mean catch to start using in first year
xL
Parameter controlling the magnitude of the target mean length of catches relative to average length in catches.
Value
A numeric vector of TAC recommendations
Details
Tested by Carruthers et al. 2015.
References
Carruthers et al. 2015. Performance evaluation of simple management procedures. Fish and Fisheries. In press.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