Simulation-based Yield-per-recruit Analysis of Pacific cod Gadus macrocephalus in Southeastern Korean Coastal Waters

摘要

We derived biological reference points for Pacific cod Gadus macrocephalus in southeastern Korean waters by applying a yield-per-recruit analysis based on a daily simulation that adopted size-dependent fecundity, growth, and natural mortality functions. This showed that the yield per recruit of Pacific cod can be maximized at an instantaneous rate of fishing mortality (F)=0.37 yr~(-1) under the current regulations, where the minimum catch size (L_c)=30 cm in total length (TL). The maximum economic yield was estimated to be attained at Lc=35-45 cm TL, if F>1 yr~(-1) but at Lc=35-40 cm TL, if F<1 yr~(-1). Despite great uncertainty in the stock assessment, to develop fisheries management plans for the sustainable exploitation of Pacific cod in southeastern Korean waters, it is necessary to estimate F using capture-recapture or other expedient methods.