GB_CC {DLMtool}R Documentation

Geromont and Butterworth Constant Catch Harvest Control Rule


A simple MP that aims for a reference catch (as a proxy for MSY) subject to imperfect information.


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



A position in the data object


A data object


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


Logical. Show the plot?


Note that this is my interpretation of their MP and is now stochastic. Currently it is generalized and is not 'tuned' to more detailed assessment data which might explain why in some cases it leads to stock declines.

The TAC is calculated as:

\textrm{TAC} = C_\textrm{ref}

where C_\textrm{ref} is a reference catch assumed to be a proxy for MSY. In the MSE C_\textrm{ref} is the calculated MSY subject to observation error defined in Obs@CV_Cref.

The TAC is subject to the following conditions:

  1. if next TAC > 1.2 last catch, then TAC = 1.2 last catch

  2. if next TAC < 0.8 last catch, then TAC = 0.8 last catch


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

Required Data

See Data-class for information on the Data object

GB_CC: Cref

Rendered Equations

See Online Documentation for correctly rendered equations


T. Carruthers


Geromont, H.F. and Butterworth, D.S. 2014. Complex assessment or simple management procedures for efficient fisheries management: a comparative study. ICES J. Mar. Sci. doi:10.1093/icesjms/fsu017

See Also

Other Constant Catch MPs: CC1()


GB_CC(1, MSEtool::SimulatedData, plot=TRUE)

[Package DLMtool version 6.0.2 Index]