A weird-looking fish that people have compared with Shrek, the animated character, has been filmed in Japan. The fish is an Asian Sheepshead Wrasse, Semicossyphus reticulatus. It is a labrid fish (family Labridae) that occurs in China, Japan, and both North and South Korea.
Many fishes develop humps and bumps on the head and other parts of the body. This is often as a result of hyperostosis ('above normal bone growth'). The enlarged forehead and chin of the Asian Sheepshead Wrasse is a good example. One more familiar to many people would be the hump on the head of a large Snapper.