^
As for the E. Eel, i dont think it stands any sort of chance. Just youtube electric eel feeding and youll find out what i mean. They need to concentrate to shock, something it would not be able to do being struck by a fast stream lined predator.
Aimara wolves should be second IMHO they are insane. Just flat out skitso when their hungry. My uncle had one years ago only for around 6 months, he never bothered having people feed his big preds when he was away, and came back to find that the aimara had shredded an aro, a school of pacu (which by now everyone knows is a bad idea, natural predation situation), and an RTC that was a couple inches smaller!
Ill try to get the pics, this was before digital photos (or at least before he got something for em haha) so he has some polaroids of the carnage and one fat happy aimara. He sold him after that
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