Does anyone here hunt? Has anyone ever tried, while field-dressing a deer or other critter, to actually cut even a small bone with a knife...with the strength of a human arm behind it? Good luck finding an aquarium fish that can do that...assuming that you can even figure out why we are trying to do so.
Weird question? Nah...
Simple teeth ain't going to cut the mustard here...or rather, the bone. Perhaps those porky monsters belonging to
pacu mom
would have a chance, but...I'd be looking for something with powerful shearing/crushing dental equipment. I think that
wednesday13
has it right with the African Lungfish or Aba Aba knife...and only the very largest specimens.