Piranhas have few natural enemies in the Amazon river. Why aren't they submerged?

Although piranhas are hot and fierce, there is a more annoying animal electric eel in the Amazon River. As a natural enemy of piranha, he seriously inhibited the reproduction of piranha. Every time I watch a movie about piranha, I think this creature is really scary! A group of piranhas can kill all creatures in a few seconds! In addition, humans perfectly understand that piranhas live in the Amazon River in movies, which leads many people to fantasize that there are a group of terrible piranhas in the Amazon River, but when they go to the Amazon River, they will find that there are not many piranhas here.

First of all, piranhas are fierce, but the number of piranhas living in the Amazon River is actually very small. They are not creatures submerged by disasters.

Full of sharp teeth, he showed cruelty before bared his teeth. Piranha is indeed one of the animals that human beings are afraid of. Piranha is so fierce, why isn't the Amazon river flooding? It has sharp teeth and is not afraid of other fish. Why does it only have a small number of fish living in the river, and even keep a low profile so that humans can't find it? Because it is not the king in the Amazon River, although it has some natural enemies, the only natural enemy is that it has nowhere to hide or even can't reproduce normally.

Secondly, the electric eel living in the Amazon River is the natural enemy of piranha. With the existence of electric eels, piranhas simply cannot grow in large numbers.

Besides piranha, the most terrible thing in Amazon is electric eel. Maybe we don't think electric eels are terrible, but they are terrible for piranhas! Electric eels feed on small fish, especially piranhas. They will be eaten by electric eels soon after they are born, and they cannot grow normally enough to really eat bones. As long as there are electric eels in the Amazon river, piranhas can't flood in this sea area.

Piranhas are not without natural enemies, but their natural enemies are in the Amazon River to inhibit their growth.