Pacu have very strong jaws and are able to crack brazil nuts. Old video from 13 years ago. You can hear the bite sounds as the pacu finish off a whole carrot I threw in the tank.
Can't really see my pacus' teeth. One of my pacu had an encounter with a tank lid left ajar, and managed to slice off his lower lip. Pretty impressive incisors - not pointy like pirranha teeth - more like human teeth. Pacu also have two rows of upper incisors. BTW, my pacu's lower lip did regenerate.
Very glad the lower lip regenerated, because he has such a beautiful grin. BTW, my pacu are both females, but I identified them as males 19 1/2 years ago, so they will forever be my boys. After all these years calling them "Leonardo" and "Adonis", to now call them "Leah" and Donna" just doesn't work for me.