Siyokoy

An aquatic creature from Philippine folklore. It is described as a brown, green or blue humanoid covered with fish scales, with fins and webbing between the fingers, as well as with a fish head, large fish eyes and sharp triangular teeth. He sinks boats and kills sailors who have sailed into his territory. He is able to take a completely human form and go out on land, seduce human girls and enter into love relationships with them. At the same time, he can stay out of the water for no more than an hour and if he does not return to the sea in time, he dies from dehydration.