Assessment of the stock status for greenland halibut (<i>Reinhardtius hippoglossoides matsuurae</i>) in the Okhotsk Sea

State of the greenland halibut stock in Sea Okhotsk fishing zone is evaluated as overfished with a high probability 97.5 % by index fishable biomass, and overfishing continued 2021. This conclusion based on results double filtering posterior parameter estimates state-space generalized surplus production model JABBA (Just Another Bayesian Biomass Assessment), additional tuning new taking into account these results. The was not caused significant changes environmental parameters (average SST EOF modes were examined), but its main reason overestimated target harvest rate established for Far East Russia 10 total biomass or half natural annual mortality (20 %). incorrect value determination age structure terminal fish scale method. approach status evaluation independent data. It includes result, refinement stringent using algorithm No-U-Turn sampler, checking hyperstability hypersensitivity. reference point between 2.5 5.4 (95 credible interval) median about 3.75 %. slightly higher than that one used ICES northeastern Atlantic (3.5 reduction to discussed), values cannot be compared because different habitat conditions probably growth Atlantic. Researches optimal level exploitation should continued; anyway, has implemented immediately at least until correction age-length key Sea. input data Stan code are presented annexes.