We don't know on this particular fish, correct. I have seen websites where they actually demonstrate how to do the procedure on Aros and Flowerhorns. For some reason there is a market for them in Asia.We don't necessarily know that that's the case. If you look closely at the back side of the aro, it looks like it healed imperfectly. I think this may have been a case of the aro having it's tail bitten off when young and it just healed that way. I have to assume that if somebody did this, the wounds would have healed a bit cleaner.