Ключевые слова: actinopterygii, amazon, amazon river, animal, aquarium, brazil, characiformes, fauna, fish, fishes, freshwater, freshwater fish, freshwater fishes, natural, nature, one, one fish, paraguay, parana, piranha, piranhas, pygocentrus, pygocentrus nattereri, red bellied, red piranha, redbellied piranha, rio de la plata, serrasalmidae, south america, south american, swim, swimming, underwater, water, wild, wild animal, wild life, wildlife,