Asian carp DNA found in Wis. Lake Michigan waters

Scientists say a water sample taken from Lake Michigan's Sturgeon Bay in Wisconsin has tested positive for Asian carp DNA.

It's the second time that genetic material from the invasive fish has been detected in the lake. The other positive hit was from Chicago's Calumet Harbor.

Dozens of samples have tested positive for Asian carp in Chicago-area waterways near the lake in recent years.

The Sturgeon Bay sample was among 50 collected in May and analyzed recently in a University of Notre Dame laboratory.

Biologist Chris Jerde says the positive hit was for silver carp, a species notorious for leaping from the water.

Jerde says it's uncertain whether the DNA came from a live fish or some other source, such as droppings from a bird that had eaten Asian carp.