The problem with mercury is that it's very persistent. Once it gets into the water, it stays around for a very long time.
Eating fish with too much mercury can cause a variety of problems including muscle weakness, and vision speech and hearing impairment. Children and fetuses are the most vulnerable. The US Environmental Protection Agency estimates there are still more than 75,000 u.s. newborns each year that may have increased risk of learning disabilities associated with mercury exposure in the womb.
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