The ocean sunfish, a creature that can weigh up to two tonnes and be covered in parasites, is explored in-depth by Sarika Cullis-Suzuki in The Nature of Things 101. This fish, known as the Mola mola, defies conventional fish appearances with its circular body, lack of a tail, and massive fins.
During the show, Cullis-Suzuki showcases the unique features of the ocean sunfish using a life-size model, highlighting why this species is often overlooked despite being one of the largest fish in the sea. These fish are remarkable for their long-distance travels, diving hundreds of meters deep multiple times daily in search of food. However, due to their slow movement, large surface area, and passage through various water zones, they attract parasites.
The Mola mola is infested with parasites on various body parts such as the skin, gills, fins, eyeballs, mouth, and intestine, with scientists identifying 73 different parasite species on these fish. Some parasites even have their own parasites. To combat this infestation, sunfish breach out of the water and slam back down, a behavior believed to help rid them of parasites. Additionally, they allow smaller fish and birds to feed on the parasites.
Despite the existing knowledge about ocean sunfish, there is still much to be discovered about this species, as stated by Cullis-Suzuki. For those interested, The Nature of Things 101 can be watched on CBC Gem and The Nature of Things YouTube channel.
