 Metals measured in the Mussel Watch Program include aluminum, antimony, arsenic, cadmium, chromium, copper, iron, lead, manganese, mercury, nickel, selenium, silicon, silver, thallium, tin, and zinc.These metals come from both natural and anthropogenic sources.Different bivalve species have different bioaccumulation abilities for trace metals, and as a result oysters will accumulate about 10 times more zinc and copper than mussels.