DLMtool (version 3.2)

LBSPRSim: Per-Recruit Length-Based Spawning Potential Ratio Simulation Model

Description

Function that takes stock (biology) and fleet (selectivity and fishing mortality) parameters and returns expected equilibrum size strucure of the catch and spawning potential ratio.

Usage

LBSPRSim(StockPars, FleetPars, SizeBins = NULL, P = 0.001, Nage = 101)

Arguments

StockPars

The life-history parameters of the stock.

FleetPars

The relative fishing mortality (F/M) and the selectivity-at-length parameters.

SizeBins

Optional - specifies the maximum length bin (ToSize) and the length increment of the binned length data (Linc). If empty, Linc = 5 and ToSize = Linf + MaxSD * SDLinf

P

Percentage of initial cohort still alive at maximum age.

Nage

Maximum age of generic age-strucured model. Not sensitive, unless set too low (e.g., < 50).

References

Hordyk, A.R., Ono, K., Sainsbury, K.J., Loneragan, N., and Prince, J.D. 2015. Some explorations of the life history ratios to describe length composition, spawning-per-recruit, and the spawning potential ratio. ICES J. Mar. Sci. 72: 204-216.

Hordyk, A.R., Ono, K., Valencia, S.R., Loneragan, N.R., and Prince, J.D. 2015. A novel length-based empirical estimation method of spawning potential ratio (SPR), and tests of its performance, for small-scale, data-poor fisheries. ICES J. Mar. Sci. 72: 217-231.