How the virus is contracted and how long it’s been around still remain a mystery. But researchers have found evidence in small mammals.
One important factor is the depth of the lake. But there are other variables too.
The European black slug was first introduced into Alaska in the 1980s in Cordova, Slowik said. It eventually made its way to Juneau and Ketchikan, likely hitching a ride on fishing gear, and is now prevalent across Southeast. A few years ago, people started seeing the slug in Whittier and Girdwood.
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