Giant Sunfish

The face of an ocean sunfish certainly leaves an impression.

So too does its size; they are the largest bony fish in the world, ranging from one to four metres across, and weighing up to a tonne.

They are called sunfish because they spend almost half their day basking motionless at the ocean’s surface, seemingly catching some rays. 

But until now it was not understood why they sunbathed, or exactly what they get up to in the deep ocean.

Ocean sunfish swam back and forth between the surface and deep water during the day. Their cycles of diving deep and then warming at the surface helped to maximize their foraging time. Each time they “sunbathed” it regulated their body temperature.

Source: BBC

N.H.Khider