Ocean pollution can also come from airborne sources. Coal-fired power plants and chlorine factories release mercury into the air, which eventually settles into the ocean. Mercury is a neurotoxin that can cause damage to the brain and nervous system. Mercury enters the systems of marine organisms and bioaccumulates, or increases, as larger fish eat smaller fish contaminated with mercury. Top predators in the ocean, such as swordfish, sharks and tuna, often have the highest concentrations of mercury. For this reason, doctors recommend limiting the consumption of some types of fish and shellfish.

To learn more information go to these websites:

http://www.seafoodwatch.org

http://www.epa.gov/choose-fish-and-shellfish-wisely

http://www.kidsafeseafood.org