👉 Plethosmylus is a type of fish that belongs to the family Percidae, and it is commonly known as the "pluton" or "plutonian" fish. These fish are primarily found in the deepest parts of oceans, particularly those located at depths ranging from 1,000 meters (3,288 feet) down to about 500 meters (1648 feet). They have a long, slender body with a distinctive