Ключевые слова: actinopterygii, amazon, america, american, animal, aquarium, bellied, belly, brazil, characiformes, closeup, colorful, couple, dangerous, de, fauna, fish, fishes, freshwater, la, life, machado, nattereri, natural, nature, negro, omnivore, one, paraguay, parana, piranha, plata, pygocentrus, red, red bellied, redbellied, rio, river, serrasalmidae, side view, south, swim, swimming, tropical, two, underwater, water, wild, wildlife, zoo,