 100s of fish groups. Red bellied piranhas like prey which is slightly bigger than them. The attacking scout signals others when the prey is found. It is done acoustically as they have great hearing. After getting signal, every fish in the group rushes in to take bite and swims off to let others. The Lobe-toothed piranha is found majorly in the Orinoco River and the Lower Amazon. The San Francisco piranha is native to San Francisco River, Brazil and is almost harmful to humans.
Also known as swell fish, puffer or blowfish is the member of group of around 90 species from Tetraodontidae family. It is known to inflate themselves so vastly with water and air that they turn globular, when disturbed. They are found in temperate and warm regions across the world, especially in sea and in fresh or brackish water. They have prickly or tough skins along with fused teeth which form beaklike structure with split in the center of all jaws. It can cause death but they are often used as food in Japan. They should be carefully cleaned and it is prepared by a well-trained chef.
2. Red Lionfish
Lion fishes make up any of various species of Indo-Pacific fishes from scorpion fish family. They are known for their toxic fin spines that can produce almost fatal, painful puncture wounds. They have elongated dorsal fin spines and wide pectoral fins. Each species have a specific pattern of zebra-like, bold stripes. When disturbed, they display their fins and spread and attack with dorsal spines, if pressed. It is one of the well-known species and it is an impressive fish stored by fish lovers. It is striped with brown, red and white and grows to around 12 inches. It is found in South Pacific reef ecosystems.
1. Payara – The Most Threatening Fish
Also called as Vampire fish, Payara is even more fatal and vicious than its name and they can cause more harm than Piranhas. It is capable to grow around 4 feet and is almost capable to prey fishes near their original size. Along with having 2 front outer tusks and sharp teeth, it is the only fish that can devour Piranhas. It shows their threat more than piranhas. They are another fatal water species.