close up of red-bellied piranha or red piranha or pygocentrus nattereri fish found from amazon, paraguay, parana and essequibo

america parana omnivore american background wild piranha red essequibo river paraguay fish pygocentrus nattereri redbellied ferocious bellied exotic animal amazon tank sharp teeth attack aquarium jaws predator natural swim mouth bite aggressive dangerous carnivore fauna colorful danger underwater wildlife nature aquatic freshwater water tropical close red-bellied found rivers