My pacu have a fish tank all to themselves, with two feeders. I've observed them eating, receiving the recently ate buff, and moused over the eggs to see how they are going. The eggs inform me that they are 86% tame. The adults die off, the eggs all hatch. Every one of the fry are 100% wild. This has happened over about three generations and two game sessions now, and I've ended up with a tropical morph that is doing the same thing. Every generation snaps back to 100% wild on hatching. I'm about to try culling them all and getting pacus from somewhere else as these were originally ones that came in a care package.
I haven't found anyone else suffering this problem?
I don't know. I just had pacus in a central pond with accessible food, midway temperature of about 27C water. And a refusal to tame.