"Ele, o Boto" is based on an old legend of a Water Sprite who takes on form of Amazon river dolphin. He only takes on his humanoid form when he wants a mate. However, the village men hate the water sprite and want him dead. All he wanted was some mates, due to his lonelyness....
Despite the low-budget, "Ele o Boto" is a wonderfully done and haunting movie that will captivate myth and folklore buffs or people whom are into dolphins, water-sprites or merfolk like creatures. I don't think CG and the big name companies at Hollywood or parts of Europe could not do something this interesting and effective.