They say the electric barrier in the shipping canal is keeping the carp at bay.
The Suez Canal is a major shipping canal with more than 2% of global oil output passing through it.
They have advanced to within 55 miles of Lake Michigan in the Illinois River, which connects with a shipping canal and other waters that reach Lake Michigan.
An electric barrier in a shipping canal near Chicago is meant to keep them from migrating into Lake Michigan, where scientists say they eventually could spread to the other Great Lakes and out-compete native fish for food.
Egypt has a lucrative industry from the shipping traffic in the Suez Canal, but it is concerned about shipping firms pursuing other routes to avoid the Gulf of Aden.
During the 1956 Suez Canal crisis shipping companies tried to be relieved of their obligations.
Egypt is on the fast track to reinstating its war against Israel and threatening international shipping in the Suez Canal.
Egypt's state prosecutor has charged 25 people, including Lebanese, Palestinians, Sudanese and Egyptians, with forming a cell to smuggle weapons across Egypt's border with Gaza, to monitor shipping in the Suez Canal and to plot attacks against Egypt itself.
ECONOMIST: Egypt accuses Lebanon��s Hizbullah of spying against it
Nasser's move harmed Israel by threatening to permanently close the Suez Canal to Israeli shipping.
The US is far more vulnerable to interruptions in the shipping lanes in the Suez Canal than Israel is.
Oil prices jumped on initial news that unrest in Egypt could topple the government and create a shipping bottleneck at the Suez Canal.
Before Saturday, the canal, a global shipping route, was considered off-limits by protesters, correspondents say.
GARCIA-NAVARRO: His economic proposals, and that is the issue that most Mexicans are interested in, revolve around the campaign of public spending, a new overland shipping route that will rival the Panama Canal, high-speed railways connecting cities and the planting of a million acres of furniture-grade forest will provide the jobs.
The Panama Canal is a bottleneck, and shipping around Cape Horn is expensive.
On Friday, shares in shipping companies rose, when worries over the Suez Canal began to emerge.
And its system of locks restricts the Panama canal to vessels of a given beam, known in shipping as Panamax.
The first and most vital is the Panama Canal which is now under the control of the Chinese shipping company, Hutchinson Whampoa.
Fine except that the canal needs to invest more, to catch up with changes in shipping.
Shipping lines worried, as some are, that local politicians may meddle in the canal's affairs, can point already to his selection of close friends and relations for the new canal board, which has angered even members of his own party.
The international shipping community prefers that the U.S. continue to play a role in running the canal.
Since bin Laden's death, jihadist forums have talked of attacks on shipping in the Strait of Hormuz at the tip of the Gulf, and in the Suez Canal.
Shipping companies are now weighing up the risks of using the short-cut route to Europe via the Suez canal.
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