Hi Pignut
No link I'm afraid but hope this helps the native White claw (which are protected) is noticably smaller than it's American cousin, the claws are of a uniform size on the whiteclawed but on the Signal one is always slightly larger,the signal crayfish will wave it's claws aggressively the white claw is less inclined to do this,the biggest giveaway is the name whiteclaw's have lighter coloured claws (not always white) while the signal's are always brick red. Mike B...