The Alaska pollack Theragra chalcogramma occupies one of the key places in the trophic chains of the Far Eastern seas as a whole and in the Kamchatka waters in particular (Shuntov et al., 1993). It is widely known that it has a great importance in the feeding of the marine animals and, in the first place, of predatory fishes. The Pacific cod Gadus macrocephalus can be considered one of its main consumers in the Kamchatka waters (Tokranov, 1986; Tokranov and Vinnikov, 1991; Borets, 1997). It is calculated that only on the western Kamchatka shelf can it eat up to 1 million t of Alaska pollack for a year (Shuntov et al., 1993 and, for example, up to 2 million t in the eastern part of the Bering Sea in particular years (Livingston and Jurado-Molina, 2000). It is evident that the cod has a considerable influence on the numbers of the Alaska pollack. In this connection it is interesting to know which part of the Alaska pollack stock is the most subject to pressure from this predator. It is clear that, in the different regions and ichthyocenoses, this influence will be SHORT COMMUNICATIONS