Í don't want to cause a debate. I have piranhas ( pygos and serras ) and I have wolfish ( Hoplias, Erythrinus and Hoplerythrinus )..Pygos only work and get frenzied in packs..Serras are mainly fin eaters, ther are not nearly as agressive as pygos.. Wolfish, mainly one of the Hopias persuasion is a killing machine and would do any like sized piranha in seconds...I find that wolves are far more predatory and dangerous than piranhas..
just my 2 cents, anyway
just my 2 cents, anyway