The Heaviest Fish

An enormous ocean sunfish caught in 1910. Its weight was estimated at 3,500 pounds.

The Heaviest Fish: Ocean Sunfish (Mola mola)

The ocean sunfish is the heaviest known bony fish in the world. It has an average adult weight of 2,200 pounds and are native to warm waters all over the world. It resembles a fish head with a tail, and its main body is flat like a pancake. Sunfish mainly eat jelly fish. Adult sunfish have few predators, but sea lions, orcas, and sharks have been known to try to hunt them. In Japan, Taiwan, and the Koreas, sunfish are considered a delicacy. They are protected by the European Union, which forbids selling sunfish meat or products. However, sunfish are accidentally caught in fishing nets. Although it is thought that their population is decline, the IUCN has not yet evaluated the sunfishes' conservation status.

Fish / Heaviest Bony Fish


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