The red swamp crayfish is native to the southern U.S., but has been prohibited in Michigan since 2014. The crayfish aggressively outcompete native crayfish for food and habitat.

The red swamp crayfish is native to the southern U.S., but has been prohibited in Michigan since 2014. The crayfish aggressively outcompete native crayfish for food and habitat.

The particular crayfish species currently inhabiting the Chicago River could be second only to Asian carp in terms of its invasiveness, and its presence there is a warning sign.

Crayfish traps were deployed in the suspect pond, leading to the capture of the invasive crustacean. Red Swamp Crayfish being collected in a retaining pond off Hagadorn Road in Novi, MI, August 2022.

Scientists have described a new species of colorful crayfish—and it might already be sitting in your aquarium. The researchers detailed their discovery in the journal Zootaxa last week. Though ...