Fratio: FMSY/M ratio methods

Description Usage Arguments Details Value Functions Required Data Rendered Equations Author(s) References See Also Examples

View source: R/MPs_Output.R

Description

Calculates the OFL based on a fixed ratio of FMSY to M multiplied by a current estimate of abundance.

A simple method that tends to outperform many other approaches alarmingly often even when current biomass is relatively poorly known. The low stock crash potential is largely due to the quite large difference between Fmax and FMSY for most stocks.

Usage

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Fratio(x, Data, reps = 100, plot = FALSE)

Fratio4010(x, Data, reps = 100, plot = FALSE)

DepF(x, Data, reps = 100, plot = FALSE)

Fratio_CC(x, Data, reps = 100, plot = FALSE, Fmin = 0.005)

Fratio_ML(x, Data, reps = 100, plot = FALSE)

Arguments

x

A position in the data object

Data

A data object

reps

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

plot

Logical. Show the plot?

Fmin

Minimum current fishing mortality rate for the catch-curve analysis

Details

The TAC is calculated as:

\textrm{TAC} = F_{\textrm{MSY}} A

where F_{\textrm{MSY}} is calculated as \frac{F_\textrm{MSY}}{M} M and A is estimate of current abundance.

The MP variants differ in the assumption of current abundance (see Functions section below)

Value

An object of class Rec with the TAC slot populated with a numeric vector of length reps

Functions

Required Data

See Data for information on the Data object

Fratio: Abun, FMSY_M, Mort

Fratio4010: Abun, Dep, FMSY_M, Mort

DepF: Abun, Dep, FMSY_M, Mort

Fratio_CC: CAA, Cat, FMSY_M, Mort

Fratio_ML: CAL, Cat, FMSY_M, Lbar, Lc, Mort, vbK, vbLinf

Rendered Equations

See Online Documentation for correctly rendered equations

Author(s)

T. Carruthers

References

Gulland, J.A., 1971. The fish resources of the ocean. Fishing News Books, West Byfleet, UK.

Martell, S., Froese, R., 2012. A simple method for estimating MSY from catch and resilience. Fish Fish. doi: 10.1111/j.1467-2979.2012.00485.x.

See Also

Other Fmsy/M methods: DynF, Fadapt

Examples

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DLMtool documentation built on Dec. 6, 2019, 9:06 a.m.