Overview
The Hoodwinker Sunfish (Mola tecta) is a colossal pelagic fish discovered in 2017 after hiding in plain sight from scientific taxonomy for nearly three centuries. Earning its specific epithet ‘tecta’ (from the Latin for hidden or disguised) because it had ‘hoodwinked’ marine biologists who previously conflated it with the common ocean sunfish, this majestic Southern Ocean leviathan drifts between freezing abyssal depths and sunlit surface waters across the temperate Southern Hemisphere.
Biology and Physical Characteristics
Mola tecta possesses a sleek, torpedo-like compressed profile that lacks the protruding head bump and chin swell of other sunfishes. Its rear clavus (rudder-like tail structure) is uniquely divided into two distinct upper and lower lobes separated by a smooth, flexible band of skin called the ‘back-fold.’ Its tough, leathery skin lacks conventional scales, enveloped in a dense collagenous sheath that provides structural rigidity. It propels its multi-ton body with synchronized sculling strokes of its elongated dorsal and anal fins.
Behavior and Ecology
The hoodwinker sunfish is an active, deep-diving pelagic predator that plunges into cold mesopelagic depths exceeding 1,500 feet (450 m) to feed voraciously on salps and colonial pelagic tunicates. After prolonged foraging in freezing deep currents, it returns to surface waters to bask horizontally, soaking up thermal warmth from the midday sun and recruiting seabirds to remove external skin parasites.
Conservation and Human Impact
Mola tecta is currently evaluated as Least Concern by the IUCN, though ongoing monitoring is required due to accidental bycatch in commercial pelagic longline tuna fisheries and midwater trawls. Marine plastic debris, particularly floating plastic bags mistaken for gelatinous siphonophores, poses a chronic ingestion threat. Protecting pelagic feeding corridors and reducing commercial discarded gear remain key conservation objectives.
Interesting Factoid
Despite weighing up to two tons and measuring over eight feet long, the Hoodwinker Sunfish evaded scientific identification until 2017 because it skillfully ‘hoodwinked’ scientists into mistaking it for other sunfish species for hundreds of years!
Last updated: October 2026