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Study: Asian carp DNA in river doesn't necessarily mean fish are there

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The latest federal research on Asian carp suggests the invasive fish does not necessarily live everywhere its DNA turns up.

The U.S. Army Corps of Engineers says the DNA can be transported by storm sewers, fish-eating birds, barges or equipment used in fisheries.

The report has implications for the debate over how to limit the spread of silver and bighead carp, whose voracious appetites have led them to crowd out native fish once the Asian carp are established.

The St. Croix River is among the places where silver carp DNA -- but no fish -- have been found. Minnesota's Department of Natural Resources launched an extensive search for Asian carp on the river in the summer of 2011, after the DNA turned up.

The Corps is working with the Fish and Wildlife Service and the Geological Survey on a three-year study of Asian carp, as the government works to keep the fish from reaching the Great Lakes and threatening the $7 billion fishing industry there.

Wednesday's report was released as elected officials including Gov. Mark Dayton and U.S. Sen. Amy Klobuchar attended an Asian carp summit meeting in St. Paul. Klobuchar renewed a call for the Corps of Engineers to close the Mississippi River shipping lock at St. Anthony Falls in Minneapolis to block the carp's ascent.

Last month the DNR proposed a barrier in St. Paul. It involves a system of lights, sound and bubbles that biologists say would discourage fish from entering the locks alongside the Ford dam.

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Federal leader of Asian carp fight focused on Great Lakes, skeptical of Miss. River plan

The Obama administration's point man in the fight against invasive Asian carp says his agency is focused on protecting the Great Lakes. But he doubts the plan Sen. Amy Klobuchar is pushing is a viable way to keep the fish out of the upper Mississippi River.

Bill in Washington would close St. Anthony Falls lock if Asian carp are found

The Army Corps of Engineers wants authority to close the lock and dam at Minneapolis' St. Anthony Falls at a moment's notice if invasive carp are found nearby. Supporters of the idea include the Minnesota DNR and Sen. Amy Klobuchar, who say stopping the migration of Asian carp up the Mississippi is needed to protect northern Minnesota waters.

Policymakers see St. Anthony Falls as line in sand in fight against Asian carp

State and federal officials are pushing a bill in Congress that would close the lock and dam at St. Anthony Falls if the invasive fish is found nearby. They say if Asian carp get any farther up the Mississippi River, they would threaten Minnesota's $11 billion tourism industry.