For decades, the signal crayfish has been an ecological troublemaker. It is invasive and widespread across Europe, Asia, and ...

Researchers have identified two new crayfish species in the Pacific Northwest, long mistaken for the invasive Signal Crayfish ...

University of Illinois researchers studying an invasive species of crayfish recently made a unique discovery — two new ...

They eat a range of aquatic plants, fish eggs, other crayfish and native invertebrates. The underside of their claws is bright red, Eaton said. He said the DNR has no idea how signal crayfish ...

To help confirm sightings of signal crayfish, photos of the blue-green patches on claws, the bright red coloring on the underside of the claws and full-body views from above and below are ideal.

Signal crayfish, an invasive nonnative freshwater crustacean species, have been found in a western Minnesota lake, according to the state Department of Natural Resources. The DNR said Friday that ...

Unusually, Brits are being asked to kill a small animal because of the deadly threat it poses to a native species. The tiny foreign invader is an American signal crayfish. The ten-legged miniature ...