Moray eels are the largest eels in the world. There are approximately 200 species of moray eels. The largest moray eel is the giant moray eel. They can grow to a length of 10 feet long and weigh 80 pounds. Scuba divers should keep a distance, as moray eels will attack scuba divers if provoked. But there have also been cases where Moray Eels have attacked scuba divers unprovoked.