An MP that uses Martell and Froese (2012) method for estimating MSY to
determine the OFL. Since their approach estimates stock trajectories based
on catches and a rule for intrinsic rate of increase it also returns
depletion. Given their surplus production model predicts K, r and depletion
it is straighforward to calculate the OFL based on the Schaefer productivity
curve. OFL = dep x (1-dep) x r x K x 2
Usage
SPMSY(x, DLM_data, reps = 100)
Arguments
x
A position in a data-limited methods data object
DLM_data
A data-limited methods data object
reps
The number of samples of the TAC
Details
Requires the assumption that catch is proportional to abundance.
Occasionally the rule that limits r and K ranges does not allow r-K pairs to
be found that lead to the depletion inferred by the catch trajectories. In
this case this method widens the search.
References
Martell, S. and Froese, R. 2012. A simple method for estimating
MSY from catch and resilience. Fish and Fisheries. DOI:
10.1111/j.1467-2979.2012.00485.x