Great Lakes

The Great Lakes are the largest freshwater system on the Earth's surface, home to a fragile fishery, and delicate shoreline beaches and dunes. They are also central to northern Michigan tourism, economies and our way of life. 

Toxic blooms of cyanobacteria have been forming on Lake Erie for several years now.

A kind of cyanobacteria called Microcystis produces a toxin that can hurt pets and make the water unsafe to drink. Back in 2014, Toledo had to shut down its drinking water supply because of the toxin.

The states around the lake – and Ontario - are working to cut back on phosphorus. It’s a nutrient that runs off from farms and wastewater treatment plants and makes those toxic blooms grow like crazy.

The Great Lakes Commission just launched a new pilot program with Michigan, Ohio, Indiana and Ontario. It’ll be a trading program for phosphorus, and they’re calling it the Erie P Market.

The U.S. and Canada have added polybrominated diphenyl ethers to their list of "Chemicals of Mutual Concern."

PBDEs are a class of flame retardants in furniture, electronics, car seats and the padding under our carpets. But the toxic chemicals don’t stay put. They leach out and build up in people and in wildlife.

Dave Dempsey is a policy advisor with the International Joint Commission. The IJC advises both countries on Great Lakes issues.

A recent study published in Environmental Monitoring and Assessments finds turtles are getting doses of heavy metals such as lead and copper.

Matt Cooper is one of the co-authors of this study. He’s a research scientist at Northland College in Ashland, Wisconsin.

Keeping Pacific salmon in Lake Michigan

Jun 14, 2016

50 years ago, officials put Pacific salmon into the Great Lakes to eat an invasive fish called the alewife, and a huge sport fishery was born.

These days, you can still catch both coho and chinook salmon. But people are worried there's not enough food in Lake Michigan for chinook salmon.

Researchers say they’ve found grass carp eggs in the Sandusky River for the first time. The river flows into Lake Erie near Cedar Point.

Grass carp are a type of invasive Asian carp. This is the first time scientists have had direct confirmation that the fish are reproducing in the river.

Holly Embke found the eggs. She’s a master’s student at the University of Toledo.

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