When they have eaten all the prey in these small bodies of water, they must search for other food sources. These starving piranhas can be very dangerous. The piranhas are well fed at the Aquarium. The serpae tetras, who share the exhibit, are too small and fast to fall prey to the much larger piranhas. They are not a typical diet item.
Freshwater stingrays are very dangerous.
They do not attack people, but their poisonous spines can cause injury to anyone who steps on them in the often opaque waters of the Amazon. Look for stingrays in exhibits at the entrance to the gallery. The electric eel is another potentially dangerous fish. Electric eels can kill by discharging between 400 and 600 volts of electricity. At 4.5 m, the arapaima is the largest fish in the Amazon, and the largest freshwater fish in the world.