Scientists spot world's largest bony fish
Scientists aboard a research vessel were treated to a sighting of the world's largest bony fish: the Mola mola.
The gigantic Mola mola is the heaviest of all the bony fish. These fish can measure 14 feet (4.3 meters) vertically and 10 feet (3 m) horizontally, and weigh nearly 5,000 lbs. (2,300 kilograms), according to National Geographic. Because the Mola mola's back fin never grows, it has a bullet-like shape and looks like a slow-swimming saucer.
The Mola mola, also known as an ocean sunfish, is commonly seen throughout the world's oceans and is considered evolutionarily advanced as they are thought to be one of the most recent fish families. However, scientists know very little about the bony fish. [What the Heck?! Images of Evolution's Extreme Oddities]