I got bit by a 12" oscar once. It startled me more than it hurt. He did manage to draw blood on both sides of my finger though. As for getting finned from catfish, rub the area that got finned on the cats belly and it won't sting any more. At least this works for native catfish, never got finned by a protical though. Yes this does work, my grandfather taught me that when I was 6 or so and have done it every time since. I got tagged by a northern pike once and that does not feel good at all and it bleed profusely for @ 30 minutes.