The ocean sunfish (mola mola) is the largest bony fish in the world. It is a unique pelagic fish, and specimens of ocean sunfish have been observed up to 3.3 m (11 ft) in length and weighing up to 2,300 kg (5,100 lb). Curiously, the Ocean Sunfish has a very small brain compared to its size: A 200 kg specimen may have a brain the size of a nut weighing only 4 g. It would explain their quiet behaviour and how often they get trapped into fisher nets.
According to the National Geographic if it lives to adulthood, a sunfish can gain over 60 million times its starting weight: "the equivalent of a healthy, bouncing human baby growing to a weight equal to six Titanics".
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