DLMtool (version 5.0)

minlenLopt1: This input control sets the minimum length of fish caught to a fraction of the length that maximises the biomass, Lopt.

Description

This aim of this simple MP is restrict the catch of small fish to rebuild the stock biomass towards the optimal length, Lopt, expressed in terms of the growth parameters Lopt=b/(M/k+b) (Hordyk et al. (2014)

Usage

minlenLopt1(x, Data, reps = 100, buffer = 0.1)

Arguments

x

A position in data-limited methods data object

Data

A data-limited methods data object

reps

The number of TAC samples

buffer

Parameter controlling the fraction of Lopt to set the minimum length of fish caught: minlen=Lopt*(0.7+buffer).

Value

The length at first caprture, LFC, and length at full selectivity

References

Hordyk, A., Ono, K., Sainsbury, K., Loneragan, N., and J. Prince. 2014. Some explorations of the life history ratios to describe length composition, spawning-per-recruit, and the spawning potential ratio ICES Journal of Marine Science, doi:10.1093/icesjms/fst235.