He was the top predator in the ocean during the late Devonian period (approximately 380 to 360 million years ago) and is known as the "king of the Devonian period". This ancient creature is known for its massive size and fierce appearance, with its head and neck covered in thick bone armor, and its jaw equipped with sharp edges resembling a guillotine, capable of cutting and crushing almost anything. Fossils are mainly found in the United States in North America, but have also been discovered in Europe. Living in shallow waters, preying on sharks, bony fish, trilobites, ammonites, and parrots. As the first super predator after the emergence of vertebrates, it disappeared during the mass extinction in the late Devonian period.

Deng's fish is a genus of fish in the family Scaridae, also known as the shell fish. It is the largest known shield skin fish, with a body length of up to 11 meters. The body shape is spindle shaped, similar to that of a shark; The head and neck are covered with thick and hard shells; The skin on the back is dark in color; The abdomen is silver in color. Living in Devonian ancient organisms, inhabiting shallower waters. Being able to prey on any creature in the ocean at that time, he was likely the first king of beasts on Earth, more than 100 million years before the birth of the first dinosaur on land. The largest predator in the Devonian ocean and the largest carnivorous fish that has ever appeared on Earth is known as the Tyrannosaurus rex in the ocean.