I was just there last weekend and the rays still had the stingers??? but once when my motoros stinger got caught in the net i used a large toe nail clipper and it worked great because it left the point nice and round and didnt even bother the ray much.
no harm to ray or me but always gotta be careful
it will regrow it's like toenail , unless ripped out at the root which is cruel and can lead to infection
probly would not recommend monthly stinger trims though