The Ohio Department of Natural Resources says the positive DNA result occurred once in 225 samples from the Maumee River. No DNA was found in 100 samples from the Sandusky River in the latest testing.
State officials say DNA from Asian carp was found in one water sample among hundreds from northern Ohio rivers feeding into Lake Erie.
No live Asian carp was found, but Dr. Carol Stepien, director of the Lake Erie Center believes some of the invasive species are already in Northwest Ohio waters. "There are other sources of environmental DNA so we can't tell if this is a live fish or not but the probability is that a few of the silver or big head carp are around," Dr. Stepien said.