Study finds increased toxic mercury levels in tuna and cod

Harvard scientists studied methyl mercury levels in fish from the Gulf of Maine, finding increases in codfish and bluefin tuna over 30 years. Climate change causes larger fish to consume more prey with higher mercury levels. Overfishing has altered the diet of Atlantic cod, leading to higher mercury intake. The study warns of health risks from consuming contaminated fish, linking methyl mercury to neurocognitive issues in children exposed in the womb.

What is the primary reason for the increase in methyl mercury levels in larger fish like bluefin tuna?

• Increased pollution in the ocean

• Climate change causing them to eat more

• Natural increase in mercury levels

• Overfishing of smaller fish

Which fish showed a 27% increase in methyl mercury levels over the past 30 years?

• Codfish

• Bluefin tuna

• Sardines

• Herring

What publication featured the study on methyl mercury levels in fish?

• Science

• The Lancet

• Nature

• New England Journal of Medicine

How has overfishing affected the diet of Atlantic cod?

• They now eat more plankton

• They have started eating seaweed

• They consume larger herrings and lobsters

• Their diet has not changed

What is a potential consequence of consuming fish with high levels of methyl mercury?

• Improved cognitive function

• Increased energy levels

• Enhanced immune system

• Long-term neurocognitive dysfunction