FEEDING LOCATION INFLUENCE ON THE HEAVY METAL CONTENT IN PINK SALMON (ONCORHYNCHUS GORBUSCHA, SALMONIDAE)

The microelement composition of the organs and tissues of the summer Japanese Sea pink salmon (Oncorhynchus gorbuscha) which returned to the shores of Sakhalin Island after sea feeding: to the Aniva Bay (pre-estuary zone of the Taranay River) and to the southwestern coast abeam Nevelsk in June-July 2019 was assessed. The fish were dissected by organs and tissues on Sakhalin, the samples were frozen and delivered to Vladivostok for chemical analysis. All elements were determined from acidic mineralizates according to GOST 26929-94 on a Shimadzu AA 6800 atomic absorption spectrophotometer in a flame (Zn, Ni, Cu, and Fe) and in a graphite cell (Pb, Cd). Confirming the results of previous studies, it was found that the content of microelements in the Japanese Sea pink salmon, indicating anthropogenic (Zn, Cu) and technogenic (Ni) impact on the environment, significantly exceeded that in fish from the Sea of Okhotsk. The number of microelements in the organs and tissues of the Sea of Japan pink salmon, indicating anthropogenic and technogenic influence during the feeding period (Zn, Cu and Ni) exceeded the corresponding indicators in the Sea of Okhotsk pink salmon by several times, for example, Ni – by 5.4, Zn – 8.8 times. The Sea of Okhotsk pink salmon twice crossed the impact geochemical and high-feeding Kuril-Kamchatka zone during its life cycle, accumulating in its organs and tissues an increased content of lead and cadmium, witnesses of underwater and surface volcanism, as well as upwellings. The content of Pb and Cd, witnesses of the natural impact situation affecting the salmon stocks of the Sea of Okhotsk, was several times higher in the organs and tissues of the Kuril and Sakhalin (from the southeastern coast) pink salmon.