Doberman pinscers have naturally floppy ears. The traditional dobie you see has had his ears fixed. What I did to my Cf in no way disabled or handicapped her. The claws are NOT used for locomotion. They are ONLY for defense and feeding. In the tank she needed no defense and she got LOTS of food and molted regularly. It's true that she could no longer "grab" things with the lower part missing. However she had EIGHT other sets of smaller claws of seize things. It just enabled her to share her habitat with other species. Of COURSE spaying /neutering is done by a trained pro. It's a SERIOUS surgical proceedure. What' I did was about as serious as trimming a mustache. So no pain, no disablity, no trauma: I think that your athesthetic sensibilities are offended. So as far as I'm concerned it's just as ethical as keeping pets in the first place. Feel free to NOT clip your crayfish.
BTW I hope you're not circumsized...
cropping the ears of doberman's was an US only fashion. and has always been illegal in the UK. it was purely for looks so it has no place in modern society. the reason for doing it a laughable, and for the most part puerile! and doing the same to the tail, for the most part just for showing, is possibly even worse.
as for saying the claws are not for locomotion, piffle and tripe, the cray uses its claws to move and manipulate its environment. could you do the things you do from day to day, if someone chopped off your thumbs? unless you are a biologist of some renown, not likely considering your appalling actions, i would suggest you provide some proof of the benefits and the physical reaction of the cray. this is not a web page from someone who does it. it is scientific proof that an animal that is born with a fixed number of manipulating digit, does not suffer when some fool cut them off.
if you are unable to keep a cray safely, don't keep one. chopping bits off so you can, and offering nonsensical reasons for doing so, is not the way anybody should go. especially in your case as you obviously don't have the knowledge to make these sort of decisions.
as i said give this hobby up, you simply are not cut out for it. I'm sure the potential stock you may buy would be grateful too. what's next cutting off the fins from a bala shark coz it needs too big of a tank. or pullin the teeth from a piranha coz you think it will ok eating puréed food? as you state, its bad enough keeping them in a tank, chopping bits off to suit you is totally vile.