The sunfish, Mola mola, is the heaviest known bony fish in the world. It has an average adult weight of 1,000 kg (2,200 lb). The species is native to tropical and temperate waters around the globe. Sunfish can be as tall as they are long when their dorsal and ventral fins are extended. Sunfish live on a diet that consists mainly of jellyfish of which they consume large amounts in order to develop and maintain their great bulk.A sunfish can carry up to 40 kinds of parasites. That's great news for cleaner fish and seagulls, who pick the parasites off the sunfish at a nearby kelp spa.