Swordfish (scientific name Xiphias gladius) typically inhabits the open seas, particularly in regions with temperate climates. However, when hunting, this species possesses a remarkable ability to “heat” its eyes, enabling it to easily detect prey in the otherwise dark depths of the ocean.
According to leading UK fish researcher, Dr. Ian Johnston from St Andrews University, this heating mechanism is located next to the fish’s eyes, capable of raising the temperature of the surrounding tissue by 10-15oC above the ambient water temperature.
At the ocean floor, where temperatures barely reach 3oC, the “heated” eyes significantly enhance their functionality, allowing swordfish to capture light and see prey quickly, up to ten times more effectively. Additionally, this unique ability enables them to comfortably dive deeper into the sea and expand their hunting grounds.
Alongside swordfish, this capability is also found in 22 other fish species, such as marlins, tuna, and certain shark species.
NGUYEN SINH
