The ocean sunfish, also known as the Mola mola, may surprise you with its massive size of up to two tonnes and its peculiar feature of being covered in parasites, even on its eyeballs. In an episode of “The Nature of Things 101,” Sarika Cullis-Suzuki explores the unique characteristics of this fish, which defies the typical fish appearance with its circular body, lack of a tail, and large fins.
During the show, Cullis-Suzuki showcases a life-size model to her co-host, Anthony Morgan, highlighting why the Mola mola, a type of ocean sunfish and one of the largest fish in the sea, is often overlooked. These fish are remarkable for their ability to travel long distances, diving hundreds of meters deep multiple times a day in search of food. However, due to their slow movement, extensive surface area, and navigation through various water zones, they become magnets for parasites.
The ocean sunfish harbors a variety of parasites, with researchers identifying 73 different species on the Mola mola and other ocean sunfish types. Some parasites even have parasites of their own. To combat these unwanted hitchhikers, the sunfish employs tactics such as breaching, jumping out of the water and slamming back down, possibly to dislodge parasites. They also allow smaller fish and birds to feed on the parasites.
Despite the current knowledge about these intriguing creatures, there is still much more to discover about the ocean sunfish. Cullis-Suzuki emphasizes the importance of further research to unravel the mysteries surrounding this species. For those interested in learning more, “The Nature of Things 101” is available for viewing on CBC Gem and The Nature of Things YouTube channel.