LMFAO @ Penn. Classic.
Never had it happen to a fish, but I've had it happen to a dog. Spot was a pitty mix who felt no pain. She got loose one day, got macked by a car; came up the drive tail just a wagging, all the skin and flesh torn off her back leg, with blood running every where; acting like nothing happened! Got her all fixed up at the vet's office, she didn't lose her leg, or any mobility, but she got real weird and unpredictable after that. Ended up putting the dog down after she tried to bite my not quite year old son. Told hubby - no more pits until after the kids are teenagers.