I am pretty sure American Alligators would probably munch on the piranhas just like their cousins the caiman.
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Along with largemouth bass and peacock bass (a known predator of piranha in the native range)...not mentioned to larger catfish. The piranha' body design is very similar to their natural prey aka the sunfish.
yes, that can happen. But in some places in some countries, piranha will survive and terrorize the waters. Cat fish and some other fish are just easy preys for a shoal of piranhas. RBP will survive because they also have a group protection.