The waters of the Kuril Islands and the Kamchatka coastal waters are areas where the effect of upwelling and volcanism is clearly manifested. However, although the high productivity of the Sea of Okhotsk and the Kuril–Kamchatka region and its causes are the subject of the detailed scrutiny of hydrobiologists, hydrochemists, and fishery science, the chemical composition of organisms and the factors that determine the content of micro-elements in organisms are much less studied. During the 1980–1990s, inhabitants of the intertidal and subtidal zones of Kamchatka and Kuril Islands, primarily indicator organisms, such as clams and brown mytilids fucus algae, interestingly showed enrichment by heavy metals — cadmium, zinc, nickel and other elements. Though these benthic organisms characterized the chemical and environmental conditions of their habitat, they did not give an idea of the more open waters of the region inhabited by nekton organisms. The most representative organisms are pelagic fish, and among them, the most important species from an economic point of view are the salmons.