Invasive Carp Detected in Wisconsin Rivers
MADISON, Wis. – The Wisconsin Department of Natural Resources (DNR) announced today that silver carp, an invasive species, have been detected in portions of the lower Chippewa River and lower Black River in western Wisconsin.
In May 2024, the United States Fish and Wildlife Service (USFWS) collected 134 water samples from the lower Chippewa River to test for invasive carp environmental DNA (eDNA). At that time, no eDNA was found for invasive carp.
In July, the DNR began receiving reports from anglers of jumping fish suspected to be invasive carp at the Dells Dam on the lower Chippewa River in Eau Claire. The Dells Dam in Eau Claire prevents further upstream passage of invasive carp in the Chippewa River System.
On Aug. 1, DNR staff went to the dam and observed jumping fish but were unable to verify the species of fish. On Aug. 27, the DNR downloaded data from an acoustic receiver tasked with listening for transmitters embedded in fish in the lower Chippewa River, 6 miles downstream of the Dells Dam. Data showed that a single silver carp, originally tagged and captured on the Mississippi River near Davenport, Iowa, was detected on July 21, Aug. 4 and Aug. 26, confirming that silver carp had migrated into the lower Chippewa River at that time. Read more