Researchers in the Great Lakes region have found new evidence that invasive Grass Carp are spawning near the mouth of the Sandusky River, a Lake Erie tributary. The discovery of more Grass Carp eggs this summer in the river points to what some scientists believe is a growing danger. Grass Carp are one of four Asian carp species threatening the Great Lakes. The next step for researchers is figuring out how to stop Grass Carp from gaining a foothold. Plans are being developed to make an intensive effort to remove the carp from the river next year.