ItargetE4:
A management procedure that incrementally adjusts the Effort to reach a target CPUE / relative abundance index.
Description
An effort-based version of the most biologically precautionary of two index/CPUE target MPs proposed by Geromont and Butterworth 2014.
Usage
ItargetE4(x, DLM_data, reps = 100, yrsmth = 5, xx = 0, Imulti = 2.5)
Arguments
x
A position in data-limited methods data object
DLM_data
A data-limited methods data object
reps
The number of 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
Imulti
Parameter controlling how much larger target CPUE / index is compared with recent levels.
Value
A numeric vector of input controls
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