Ключевые слова: actinopterygians, actinopterygii, amazon, animal, aquarium, aquatic, biology, black, black finned, black finned pacu, black pacu, blackfinned, blackfinned pacu, brazil, brazilian, cachama, characiformes, colosoma, colossoma macropomum, fauna, finned, fish, fresh, fresh water, freshwater, freshwater fish, gamitana, giant, giant pacu, macropomum, natural, nature, pacu, portrait, rayfinned, rayfinned fish, serrasalmid, south america, south american, species, tambaqui, underwater, water, wild, wildlife, zoo, zoology,