DLMtool (version 3.1)

LstepCC1: A management procedure that incrementally adjusts the TAC according to the mean length of recent catches.

Description

The least biologically precautionary of four adaptive length-based MPs proposed by Geromont and Butterworth 2014. Tested by Carruthers et al. 2015

Usage

LstepCC1(x, DLM_data, reps = 100, yrsmth = 5, xx=0, stepsz=0.05, llim=c(0.96,0.98,1.05))

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

stepsz

Parameter controlling the size of the TAC update increment.

llim

A vector of length reference points that determine the conditions for increasing, maintaining or reducing the TAC.

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