Their necks are short, their heads are hard, and their tails are shaped like "you". Their bodies are very flat and oval as a whole; Their body color is generally gray-green, their backs are slightly black and their bellies are red. Their personalities are fierce.
Most piranhas are carnivorous, while others are omnivorous. They can eat meat and other foods such as plants. Piranhas may eat people. In their native South America, there are records of their attacks on humans. However, there are still relatively few cases in which they attack humans. Compared with humans, some weak animals are more attractive to them.
Moreover, a single piranha is timid and small, and may bite people, but it is basically impossible to eat people. Only groups of piranhas can eat people when they lack food.
Living habits
Piranhas inhabit the main stream and larger tributaries, where the river is wide and the water is urgent. Adult fish mainly feed at dawn and dusk, mainly insects, worms, small fish and carrion, but some of them only eat plants and small fish. The activities are mainly during the day, and will rest in a sheltered place at noon.
"Piranha" is not strict with water quality, and likes weak acidic soft water. The water temperature suitable for growth is 22 to 28 degrees Celsius. Most of these fish feed in groups, and the staple food is relatively small fish. They hunt anything that moves in the water, especially something sensitive to the smell of blood. Any smell of blood will arouse a large group of "piranhas" to attack fiercely. "Piranha" is strong and easy to raise, but it is not suitable for mixed culture with fish without self-protection ability.