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Internal optimization function
DBSRAopt(lnK, C_hist, nys, Mdb, FMSY_M, BMSY_K, Bt_K, adelay, opt = 1)
log unfished biomass
Historical catches
number of years (length of C_hist)
M
FMSY/M
BMSY/K
Current depletion
age of maturity
Numeric. 1 for optimization. 2 to return Biomass trend