ML,
None yet, about once a month we net out 50 or so of the little guys and see what we have, so far it is almost all tilapia, with a very few silver barbs. My pacu are only about 2 1/2 years old.
Try as I may I can't find anything on breeding. I read that, in their home habitat they move from the rivers into lakes to spawn, but I don't know if they breed there as well. I will keep looking, they are breed here in my neighborhood but I haven't found the place yet.
Ml, have you provided a chew toy? Early on we had placed some 1/2 gallon plastic milk bottles around the pond for bouys when we raced electric boats. One was sunk and the other 3 had bite marks on the submerged parts. Give you some idea what they do to my water plants. I don't know if they are playing, mad or hungry.
Here is a not so helpful link:
http://www.aquaculture.org.gy/Technical%...ater%20Pacu.pdf