Kinda unrelated...not sure if its a bad unhook job or a turtle attack...at the local lake, we get alot of badly bitten by turtles Catfish, Sunfish, etc but I once landed a very big Pumpkinseed with no lower jaw. Not bloody, and was able to outcompete about 30 other Sunfish frenzied around my bait. Not bad. Fish can cope with injuries surprisingly well.
My Dad once caught a 6 inch Cocktail Bluefish that had bite marks on the gill, face, and midsection, and, examining the halfmoon bite's position, it was obvious that the fish was attacked head first, swallowed down to the tail, and escaped.
Yet he was OK enuf to hit a bottom bait. And to fight the whole way up!