Let me make this clear... this specimin is going to be 'put down' soon anyway.
I am moving to Michigan soon and he won't be making the trip with me as my tanks are going into storage for a while. In Arizona, he is illegal for sale or trade and none of my friends with tanks have room for him. I have already shut my other tanks down so I'm not moving him at this point. All of my other aquarian pets have been sold, traded for gear or are getting adopted by friends. I can't do anything with this particular beast. I might even boil and eat him just for the hell of it!
I've kept many crays with varied results over the past 4 years. And I plan on mini-farming crays in the future for food purposes and as pets (depending on the species I collect)
I WON'T put him into the local ecosystem and am planning on "offing" him within the next two months anyway. At least I can LEARN something by experimenting on him - as I will keep crays exclusively once settled in Michigan - rather than be a bleeding heart and spare the pain of one cray while the rest of my tank's residents are getting suddenly terrorized.
Again, I've had this particular creature for nearly two years without incident until the last two weeks...
I am clipping the "thumb" of his claw tonight. I will use a scalpel as to not butcher them up. I will not "rip" off the entire appendage, I am only rendering it non-functional.
Call me "cruel" if you must, but I think the knowledge gained will help the hundreds of other crays I plan on keeping in the future.