This fish is not a hybrid of any type.... Bifa all the way. I have had 20 over the past year or so. All shapes and sizes from 1" to 12" and I can tell you its not a hybrid. I have also kept every kind of Vieja available. That fish is not Fene red/ blue/ or piebald, its not a Zontaus, this species was my favorite until I kept umbees. And I'm still a die hard Vieja fan. Can I be sure of this fish without knowing its lineage? No. But I can say with my experience it has no features that lead me to believe that it is a hybrid.
Drew