Higher mercury in St. Louis River walleyes comes from old pollution
Higher mercury in St. Louis River walleyes comes from old pollution A new study shows mercury in the estuary sediment was left by industry decades ago. It continues to build up in fish, making some unsafe to eat. 6:05 am, Apr. 17, 2021 × Clough Island in the St. Louis River estuary. A new study has found that the source of unusually high mercury levels in estuary fish is legacy mercury from decades ago that remains in the sediment. (Bob King/ News Tribune file / 2012) For decades now, health officials in Minnesota and Wisconsin have warned people to limit their meals of...
Source: duluthnewstribune.com