Once you put them in an aquarium with water conditioners and feed them processed "fish food" they are no longer considered safe for human consumption.
Self cloning cray fish would not be worth the trouble trying to raise as food.
I would look into the following species: Orconectes rusticus, Pacifastacus leniusculus, Procambarus clarkii. Keep in mind local and state laws may prohibit the retention of cray fish that aren't gathered for food with a valid license.
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