DLMtool (version 5.2)

LBSPR: Length-Based SPR Effort Control

Description

The spawning potential ratio (SPR) is estimated using the LBSPR method and compared to a target of 0.4.

Usage

LBSPR(x, Data, reps = NA, plot = FALSE, n = 5, smoother = TRUE,
  frac = 0.1)

Arguments

x

A position in a data-limited methods data object

Data

A data-limited methods data object

reps

The number of stochastic samples of the MP recommendation(s)

plot

Logical. Show the plot?

n

Last number of years to run the model on.

smoother

Logical. Should the SPR estimates be smoothed?

frac

The fractional adjustment in effort if SPR is outside of target range

Value

An object of class Rec with the TAE slot(s) populated

Required Data

See '>Data for information on the Data object

LBSPR: CAL, CAL_bins, L50, L95, LHYear, Mort, Year, vbK, vbLinf, wlb

Rendered Equations

See Online Documentation for correctly rendered equations

Details

Effort is increased by 10 per cent if the ratio of \(\frac{\textrm{SPR}}{\textrm{SPR}_{\textrm{targ}}}\) is \(\geq 1.25\), reduced by 10 per cent if the ratio is < 0.75, and remains unchanged otherwise.

The effort HCR has not been tuned. The increase/decrease in effort can be adjusted using the frac argument.#'

References

Hordyk, A., Ono, K., Valencia, S., loneragan, N., and Prince J; A novel length-based empirical estimation method of spawning potential ratio (SPR), and tests of its performance, for small-scale, data-poor fisheries, ICES Journal of Marine Science, 72 (1) 2015, 217-231,

Examples

# NOT RUN {
LBSPR(1, Data=DLMtool::SimulatedData, plot=TRUE)
# }