Red swamp crayfish (Procambarus clarkii) is listed as a prohibited species in the state of Michigan. As a result, this means that selling, importing, cultivating or transporting this species is not allowed. Michigan has five species of native and invasive crayfish, however, this invasive species can be distinguished by the bright red raised bumps on their claws.
It is not currently widely distributed in the state and on-going survey and control work seeks to limit its spread. Currently, they have been positively identified in Farmington Hills, Livonia, Novi, and Shelby Township. If you believe you have found this species, please immediately report this species us or DNR Fisheries Division! Please include clear pictures to help with ID.
Environmental Impacts
Red swamp crayfish cause multiple environmental impacts. They outcompete native species and reduce amount of quality habitat available for invertebrates and other aquatic life. Their burrowing behaviors can increase the risk of cyanobacteria blooms and destabilize stream banks. Red swamp crayfish may also transmit a crayfish plague to native species who have no immunity to the disease.
Treatments
Research is still being done to determine the best way to control invasive red swamp crayfish. However, there are ways to do your part on preventing the spread of this species. Do not buy or release any captive animal into Michigan waterways. As always, clean, drain, and dry your water craft.