"Very little is known about this species. We know nothing about where marbled crayfish originated, or whether any populations even exist in the wild. If you are thinking about keeping these as pets, please take the utmost care that ensure none enter local waters. They have the potential to be a terrible pest. I would hate for Marmorkrebs eventually being mentioned in the same breath as cane toads or zebra mussels."
I found this on-line . Also there are no known population in North America so they are invasive.