The Michigan Department of Natural Resources today announced that the latest round of Asian carp environmental DNA sampling on the lower Kalamazoo River in Allegan County produced all negative results.Earlier this month the DNR and U.S. Fish and Wildlife Service (USFWS) announced a single positive eDNA result for silver carp – a species of Asian carp – within the river, discovered during water sampling efforts conducted this summer.   

Immediately after the DNR learned of the positive sample, the agency worked with USFWS to conduct this third eDNA surveillance effort. The two agencies collected 200 additional water samples on the lower Kalamazoo River Oct. 7 and 8. In addition to sampling, the DNR increased the presence of staff along the river to enlist anglers as part of surveillance efforts. 

The previous positive result indicated the presence of genetic material of silver carp, such as scales, excrement or mucous. However, there is no evidence a population of silver carp is established in the Kalamazoo River. In addition to live fish, genetic material can enter water bodies via boats, fishing gear and the droppings of fish-eating birds. 

“We greatly appreciate the quick work by USFWS to collect and evaluate these latest samples,” said DNR Fisheries Division Chief Jim Dexter. “We are pleased these samples were negative, but that doesn’t mean our efforts to keep Asian carp out of Michigan’s waters are over.”

The DNR will continue to take action in response to the previous positive result. Those actions will include:

• Conducting additional sampling efforts in the spring with USFWS to continue monitoring the river.

• Enhancing DNR fishery survey efforts, including expanding our outreach to anglers.

• Continuing public education efforts about all aquatic invasive species, including Asian carp, to increase general understanding of the threat to Michigan’s waterways. 

Anglers are urged to become familiar with the identification of Asian carp, including adults and juveniles, as the spread of juvenile Asian carp through the use of live bait buckets has been identified as a potential point of entry into Great Lakes waters.

Anglers and boaters are strongly encouraged to drain all water from their boats and to clean boats and gear after each trip. Invasive species and eDNA are known to “hitchhike” within live wells and attach to boat trails, anchors and fishing gear.

Map courtesy Michigan DNR
Map courtesy Michigan DNR

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