For decades, the signal crayfish has been an ... "By the time we discovered the misfortunate crayfish, it had already lost much of its native range to the invasive rusty crayfish," Larson said.

Another new species, the Misfortunate Crayfish (Pacifastacus malheurensis), occurs in streams and rivers of central and eastern Oregon. URBANA, Ill. — For decades, the Signal Crayfish has been ...

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.