Invasive Red Swamp Crayfish Found in Cass County
A new invasive species has been confirmed in Southwest Michigan, and local residents are being asked to keep an eye out.
The Michigan Department of Natural Resources recently confirmed the first detection of invasive red swamp crayfish in Cass County. Two crayfish carcasses were discovered in a private pond near Niles during a survey conducted by the SW x SW Corner Cooperative Invasive Species Management Area (CISMA).
Red swamp crayfish are native to the southern United States but have been prohibited in Michigan since 2014. They can reproduce quickly, compete with native species, damage aquatic plants, and create burrows that can contribute to shoreline erosion and instability.
What should you look for?
Red swamp crayfish are generally 2–6 inches long and may be brown, dark red, or even unusual colors such as blue or white. Look for:
Raised red bumps on the body and claws
Long, slender claws
An hourglass-shaped marking on the back that touches in the middle
A dark triangle on the top of the tail
If you think you've found one, don't release it back into the water. If possible, collect the specimen, place it in a bag, and freeze it. If you cannot collect it, take clear photos of the top, sides, underside, and claws, and record the location, date, and time.
Reports can be made to Kathleen Quebedeaux with the Michigan DNR Fisheries Division at QuebedeauxK@Michigan.gov or 734-780-5571.
Early detection is one of our best tools for slowing the spread of invasive species. If you're spending time around ponds, rivers, and other waterways in Berrien or Cass County, keep your eyes open and report anything suspicious.
When in doubt, snap a photo and report it!
