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Posted by on Mar 27, 2016 in Tell Me Why |

What Is a Mola Mola Sunfish?

What Is a Mola Mola Sunfish?

The ocean sunfish, commonly known as the mola or sunfish, scientifically known as Mola mola (which is where its common name “mola” comes from), tends to make its home in the deep waters of temperate and tropical oceans.

Their large, silvery bodies can occasionally be seen near the surface, where they go to soak up the Sun’s rays. This is also when their dorsal fins may break the surface, making swimmers think sharks are near.

The largest ocean sunfish can span up to 14 feet vertically and 10 feet horizontally. Even though they’re large fish, their appearance is a bit odd, since they often look like only half a fish. Their bullet-like shape develops because their back fin never grows.

Instead, as ocean sunfish grow, the back fin folds in on itself, creating a rounded, rudder-like appendage called a clavus.

Adult ocean sunfish weigh an average of 500-2,000 pounds. However, the largest examples of the species can weigh over 5,000 pounds! Some sharks and rays can weigh even more, but they’re considered cartilaginous rather than bony fish.

Despite their large size, ocean sunfish have fairly small mouths. Their primary and favorite food is jellyfish, but they also will eat small fish, plankton, and algae when jellyfish are unavailable.

If you happen to see an ocean sunfish, you may notice its rough skin covered with parasites. They’re prone to parasite infestations and will sometimes leap out of the water and land flat like a belly flop in an attempt to shake them off. They’ll also occasionally stay near the surface to let small fish and birds feast on the parasites.

Content for this question contributed by Ginger Fields, resident of Carlsbad, San Diego County, California, USA