yes they are native, central virginia, and this is just a guess by what they very much look like and most definitely do not look like
they are not agressive with fish, just with themselves, theyll eat each other if a hardcore fight breaks out, and theyll grow to their surroundings, found one in a small part of the creek about an inch long and found another in the same creek, bigger space, about 5 inches long. i dont know what else the species name would give you info on, but here they are.
hobbs: cambarus hobbsi
dulanes: procambarus tulanei
just checked out a site off google, and they are definitely in the cambarus genus, shorter fatter claws
check it out, they look more like the one with the hints of blue in the larger picture than any of the others, colors vary, have some bluish, some gray, some tan, and a very red one.
cant get the link to work, just google 'virginia crayfish' and its the first one