Ichthyo sapiens are a species of amphibious humanoid creatures of mysterious origins. There are just a few know individuals from this species, most notably Abraham Sapien.
The Ichthyo sapiens have a pair of gills, allowing them to breath underwater, but also have a set of normal human lungs allowing them to stay above and out of water for long periods. However, they need to regularly "get wet" to keep them from becoming too weak. The Ichthyo possess webbed hands and feet, and have large, bright eyes that help to see in thick murky water. Sometimes they have distinctive black/blue stripes vertically overlapping their forehead in a shape reminiscent of a "V", and are incredibly good high-level swimmers, thanks to their athleticism and peak-conditioned body. In Guillermo del Toro's film, Abraham Sapien possesses unique psychic abilities as well.