Wikipedia
Fish-man
The fish-man of Liérganes , is a cryptid which belongs to the mythology of Cantabria, located in the north of Spain. The fish-man of Liérganes would be an amphibian human-looking being, that looked a lot like a metamorphosis of a real human being who was lost at sea. His story was examined by the Enlightenment writer Benito Jerónimo Feijoo, who claimed that the story of the fish-man of Liérganes was true.