Conclusion
Withal, the wild Pacific pink and chum salmons caught in the Kuril waters, meets the requirements for seafood for the content of the regulated toxic elements Cd, Pb, As and Hg. The content of each element does not exceed the maximum permitted concentrations approved by the Russian standards. Differences in the content of elements in wild Pacific salmon and Atlantic salmon bred in ponds represent a great scientific and practical interest. Higher concentrations of Zn and Cu in farmed salmon and of Pb in pink and chum salmons from the Kuril waters are caused by the same factor — the geochemical conditions of the environment. However, the impact conditions of the coastal waters evaluated by such tracers as zinc and copper are caused by anthropogenic activity, while the impact zones in the waters of the Western Pacific are formed under the influence of natural factors of modern volcanism and upwelling.