Using the state-space separable cohort model modification for assessment of Pacific cod Gadus macrocephalus (Gadidae) stocks in the Petropavlovsk-Komandorskaya subzone

Results of using a state-space cohort model with smoothing unscented Kalman filter for assessment of Pacific cod stock abundance and the other population parameters in the Petropavlovsk-Komandorskaya Subzone are presented. Series of numerical experiments were carried out with various variants of the recruitment model. The results of the work performed can be used in preparing forecasts of the TAC of marine commercial fish in terms that the observational data allow the use of age-structured models in the state space.