Worldwide, larger fish species tend to have the highest levels of mercury, because the element accumulates in their tissues as they live longer and eat other mercury-contaminated organisms. The problem is especially acute in the Amazon because of the expansion of poorly regulated gold mining that uses mercury to separate gold from river sediments.
read more... https://www.technologynetworks.com/applied-sciences/news/smaller-fish-offer-better-nutrition-for-amazonians-395257
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