Carp DNA Is Found in Lake Michigan



By SUSAN SAULNY
Published: January 19, 2010

CHICAGO — Genetic material from the Asian carp, a voracious invasive species
long feared to be nearing the Great Lakes, has been identified for the first
time at a harbor within Lake Michigan, near the Illinois-Indiana border,
ecologists and federal officials said Tuesday.
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A second DNA match was found in a river in Illinois within a half-mile of the
lake, according to scientists at the University of Notre Dame who tested water
samples and provided the results to officials last week.

Experts said the most recent findings, from Calumet Harbor and the Calumet
River, could mean that the carp has found its way beyond an elaborate barrier
system built at the cost of millions of dollars to prevent the fish’s access to
the Great Lakes and its delicate ecosystem, where it has no natural competitors
and would threaten the life of native fish populations.

“It’s a big admission of failure,” said Henry Henderson, the director of the
Midwest program at the Natural Resources Defense Council. “It indicates the kind
of thing we’ve been fearing since 1993.”

Government officials were careful to underscore that they had not found any fish
— dead or alive — despite much effort, and that the Asian carp’s DNA could have
arrived in Lake Michigan by various means other than the fish’s swimming from
river basins it has already overtaken farther south.

“Because we don’t know for sure that the source of the DNA is live carp, we’re
taking it as an early warning that it may be live carp,” Maj. Gen. John W.
Peabody of the Great Lakes and Ohio River Division of the United States Army
Corps of Engineers said during a conference call to announce the findings.

“As to how they got there,” General Peabody said, “the short answer is we don’t
know, and there’s probably no way for us to ever tell.”

Still, Great Lakes advocates and the expert who conducted the tests seemed more
convinced of the fish’s physical presence in or near Lake Michigan.

“I think there’s not another plausible explanation for the presence of DNA that
we’ve found other than that there are live fish in the vicinity,” said David M.
Lodge, a professor of biological sciences at Notre Dame, whose team tested the
water samples.

The positive DNA findings were announced on the same day the United States
Supreme Court denied a request by the State of Michigan for an emergency
injunction to force the closing of the locks of a Chicago shipping canal that
gives direct access to the lake — a coincidence that drew intensified calls for
help from some Great Lakes states.

The Corps of Engineers and Illinois officials had argued against closing the
canal.

But Gov. Jennifer M. Granholm of Michigan and Gov. James E. Doyle of Wisconsin
called on the Obama administration on Tuesday to convene a summit and identify
an emergency “rapid response” that Great Lakes states must adhere to to protect
the waters from being overrun with Asian carp.

Professor Lodge said the findings and the court ruling “highlight the urgency”
of action to protect the Great Lakes, which support a $7 billion fishing
industry and contain 20 percent of the world’s freshwater.

http://www.nytimes.com/2010/01/20/science/20carp.html