A comparison of the data in Tables 3 and 4 indicates that the fillets of salmon grown in fish ponds contains 5–10 times more zinc and copper than the wild Pacific salmon muscle. As was noted above, Zn and Cu are the tracers of anthropogenic impact on the environment and biota. There is no doubt that salmon bred in the inshore zone will be affected by higher contamination of shallow water compared to the open ocean. Additionally, there is an impact of feed prepared by man, sometimes containing freshwater fish. Finally, regardless of the manufacturers' endeavors, Norwegian fish will be affected by the influence of the Gulf Stream, a powerful stream of starting off the American coast that collects the coastal effluents and discharges them on the Scandinavian shore.