Wis. scientists hope warmer lake kills smelt

Madison, Wis. (AP) – Researchers in Madison are hoping to rid a
northern Wisconsin lake of an invasive fish species by manually
raising the water’s temperature.

Scientists from the University of Wisconsin-Madison plan to stir
up the waters of 83-acre Crystal Lake in Vilas County. The goal is
to mix warmer water above with the cooler water below where rainbow
smelt thrive.

The school says rainbow smelt threaten native species such as
walleye and perch.

The scientists think their efforts will raise the lake’s
temperature by about 6 degrees Fahrenheit. They hope that either
kills smelt outright or stresses them enough to affect their
reproduction and survival.

UW-Madison researcher Steve Carpenter says the higher
temperature shouldn’t affect walleye and perch.

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