They have some wicked looking teeth, but what about their jaw pressure? In the wild, pacus eat like nuts and stuff which they can crack w/ their front teeth, and the teeth arent small either. I got bit by my pacu a few years ago, it was about 14," and let me tell you, it wasnt fun. It put a nice hole in my finger that wouldnt stop bleeding, but at least I didnt need stiches!