The Michigan Department of Natural Resources is investigating an infestation of invasive red swamp crayfish found in Cass County.
While colder temperatures are slowing them down, state wildlife officials said the threat is not going away. Native to the southern United States, the crayfish become more active as temperatures rise. The DNR plans to assess the extent of the infestation next spring, when warmer weather makes the crayfish easier to detect.
Kathleen Quebedeaux, fisheries biologist for the Michigan Department of Natural Resources, said the state will have people in the field to learn more as they work toward next steps…