- Associated Press - Monday, October 27, 2014

LANSING, Mich. (AP) - Officials say no genetic material from Asian carp showed up during the latest round of testing in the lower Kalamazoo River.

The Michigan Department of Natural Resources said Monday that 200 water samples taken Oct. 7-8 yielded no positive DNA readings for the invasive fish in the river, a Lake Michigan tributary.

The additional testing was ordered after a single positive result for silver carp was recorded from a sample this summer.

Silver and bighead carp have migrated up the Mississippi River and are threatening to reach the Great Lakes, where they could out-compete native fish for food.

Live fish can leave behind their DNA by shedding scales, excrement or mucous. But officials say genetic material also can get into waters from boats, fishing gear and droppings of fish-eating birds.

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