Inumerous studies have been conducted to identify the stock structure of Pacific cod along its distribution. Significant differences have been identified among southern Kuril Islands and Bering Sea, Sea of Okhotsk, and the coastal waters of Canada (Stroganov et al. 2009). Other similarities and differences are found in the region (Orlov et al. 2008; Stroganov and Orlov 2012). Identification of populations is thus not yet totally clear within Russian waters, justifying the existence of recent studies and discussions about the matter (e.g. Orlov et al. 2014) that considers that the boundaries currently used are based on administrative and geographical principles rather than on biological assumptions. Therefore the following units are considered for assessment and management purposes: W Bering Sea (including Chukotka), Karaginsky and Petropavlovsk-Komandor.