Salmon contains organic mercury, parasites, bacteria, PCBs and other harmful toxins – Farmed or Atlantic salmon is the worst! Canned or Wild Salmon from Alaska is the best. Atlantic salmon is endangered in the US and cannot be farmed commercially; wild Salmon from Alaska is low in contaminants; children and pregnant women should keep intake low; there are five species of wild salmon from Alaska: chinook, chum, coho, pink, and sockeye. Wild Atlantic salmon from Alaska is best; from Washington is worst – HIGH PCBs; children no more than once per months; women no more than twice per month; men no more than once per month; Atlantic salmon are usually farmed in large-scale, densely stocked netpens that pollute surrounding waters with waste and chemicals; fish can escape and compete for resources, breed with or spread parasites to wild fish. Atlantic salmon are native to the North Atlantic Ocean. In Europe, they occur from the Arctic circle to Portugal. In North America, they range from Quebec to Connecticut. Landlocked populations are distributed in Russia, North America and northern Europe. In addition, Atlantic salmon have been extensively introduced around the world. Although a small number of wild Atlantic salmon are caught in northern Europe, farmed fish are predominant. The main sources of farmed salmon are Norway, the United Kingdom and Chile. Atlantic salmon sold in the U.S. market are primarily farmed fish from Chile and Canada.